If you could help me out, thanks.

           using System;
            using System.Collections.Generic;
            using System.ComponentModel;
            using System.Data;
            using System.Drawing;
            using System.Linq;
            using System.Text;
            using System.Windows.Forms;
            using System.IO; // Adds all stuff for files

            namespace WindowsFormsApplication1
            {
                public partial class Form1 : Form
                {
                    static String fileloc;



                    public Form1()
                    {
                        InitializeComponent();

                        ContextMenu editorMenu = new ContextMenu();
                        editorMenu.MenuItems.Add("Cut", cutToolStripMenuItem_Click);
                        editorMenu.MenuItems.Add("Copy", copyToolStripMenuItem_Click);
                        editorMenu.MenuItems.Add("Paste", pasteToolStripMenuItem_Click);
                        editorMenu.MenuItems.Add("Text Preset", button5_Click);




                        textBox1.ContextMenu = editorMenu;
                        textBox2.ContextMenu = editorMenu;
                        textBox3.ContextMenu = editorMenu;
                        textBox4.ContextMenu = editorMenu;
                        textBox5.ContextMenu = editorMenu;

                    }

                    private void Form1_Load(object sender, EventArgs e)
                    {

                    }

                    private void label5_Click(object sender, EventArgs e)
                    {

                    }


                    private void button5_Click(object sender, EventArgs e)
                    {
                        textBox1.Text = "How are you?";
                        textBox2.Text = "Cool, thanks.";
                        textBox3.Text = "So what are you up to?";
                        textBox4.Text = "Alright well, got to go, see you later.";
                        textBox5.Text = "3";

                        textBox1.ForeColor = Color.Black;
                        textBox2.ForeColor = Color.Black;
                        textBox3.ForeColor = Color.Black;
                        textBox4.ForeColor = Color.Black;
                        textBox5.ForeColor = Color.Black;
                    }

                    private void button6_Click(object sender, EventArgs e)
                    {
                        textBox1.ForeColor = Color.Red;
                        textBox2.ForeColor = Color.Red;
                        textBox3.ForeColor = Color.Red;
                        textBox4.ForeColor = Color.Red;
                        textBox5.ForeColor = Color.Red;
                    }

                    private void textBox6_TextChanged(object sender, EventArgs e)
                    {

                    }

                    private void customizeToolStripMenuItem_Click(object sender, EventArgs e)
                    {

                    }

                    private void newRomanToolStripMenuItem_Click(object sender, EventArgs e)
                    {
                        textBox1.Font = new Font("Times New Roman", 10);
                        textBox2.Font = new Font("Times New Roman", 10);
                        textBox3.Font = new Font("Times New Roman", 10);
                        textBox4.Font = new Font("Times New Roman", 10);
                        textBox5.Font = new Font("Times New Roman", 10);
                        textBox6.Font = new Font("Times New Roman", 10);

                        button1.Font = new Font("Times New Roman", 9);
                        button2.Font = new Font("Times New Roman", 9);
                        button3.Font = new Font("Times New Roman", 9);
                        button4.Font = new Font("Times New Roman", 9);
                        button5.Font = new Font("Times New Roman", 9);
                        button6.Font = new Font("Times New Roman", 9);

                        label1.Font = new Font("Times New Roman", 10);
                        label2.Font = new Font("Times New Roman", 10);
                        label3.Font = new Font("Times New Roman", 10);
                        label4.Font = new Font("Times New Roman", 10);
                        label5.Font = new Font("Times New Roman", 15);
                        label6.Font = new Font("Times New Roman", 8);
                        label7.Font = new Font("Times New Roman", 10);
                    }

                    private void tahomaToolStripMenuItem_Click(object sender, EventArgs e)
                    {
                        textBox1.Font = new Font("Tahoma", 9);
                        textBox2.Font = new Font("Tahoma", 9);
                        textBox3.Font = new Font("Tahoma", 9);
                        textBox4.Font = new Font("Tahoma", 9);
                        textBox5.Font = new Font("Tahoma", 9);
                        textBox6.Font = new Font("Tahoma", 9);

                        button1.Font = new Font("Tahoma", 9);
                        button2.Font = new Font("Tahoma", 9);
                        button3.Font = new Font("Tahoma", 9);
                        button4.Font = new Font("Tahoma", 9);
                        button5.Font = new Font("Tahoma", 9);
                        button6.Font = new Font("Tahoma", 9);

                        label1.Font = new Font("Tahoma", 9);
                        label2.Font = new Font("Tahoma", 9);
                        label3.Font = new Font("Tahoma", 9);
                        label4.Font = new Font("Tahoma", 9);
                        label5.Font = new Font("Tahoma", 15);
                        label6.Font = new Font("Tahoma", 8);
                        label7.Font = new Font("Tahoma", 9);
                    }

                    private void colorToolStripMenuItem_Click(object sender, EventArgs e)
                    {

                    }

                    private void purpleToolStripMenuItem_Click(object sender, EventArgs e)
                    {
                        textBox1.ForeColor = Color.Purple;
                        textBox2.ForeColor = Color.Purple;
                        textBox3.ForeColor = Color.Purple;
                        textBox4.ForeColor = Color.Purple;
                        textBox5.ForeColor = Color.Purple;
                    }

                    private void blackToolStripMenuItem_Click(object sender, EventArgs e)
                    {
                        textBox1.ForeColor = Color.Black;
                        textBox2.ForeColor = Color.Black;
                        textBox3.ForeColor = Color.Black;
                        textBox4.ForeColor = Color.Black;
                        textBox5.ForeColor = Color.Black;
                    }

                    private void redToolStripMenuItem_Click(object sender, EventArgs e)
                    {
                        textBox1.ForeColor = Color.Red;
                        textBox2.ForeColor = Color.Red;
                        textBox3.ForeColor = Color.Red;
                        textBox4.ForeColor = Color.Red;
                        textBox5.ForeColor = Color.Red;
                    }

                    private void orangeToolStripMenuItem_Click(object sender, EventArgs e)
                    {
                        textBox1.ForeColor = Color.Orange;
                        textBox2.ForeColor = Color.Orange;
                        textBox3.ForeColor = Color.Orange;
                        textBox4.ForeColor = Color.Orange;
                        textBox5.ForeColor = Color.Orange;
                    }

                    private void exitToolStripMenuItem_Click(object sender, EventArgs e)
                    {

                    }

                    private void exitToolStripMenuItem_Click_1(object sender, EventArgs e)
                    {
                        Application.Exit();
                    }

                    private void exitToolStripMenuItem1_Click(object sender, EventArgs e)
                    {
                        Application.Exit();
                    }

                    private void openToolStripMenuItem_Click(object sender, EventArgs e)
                    {
                        TextReader tr;
                        openFileDialog1.InitialDirectory = @"C:\test";
                        if (openFileDialog1.ShowDialog() == DialogResult.OK)
                        {
                            try
                            {
                                tr = new StreamReader(openFileDialog1.FileName);
                                textBox1.Text = tr.ReadToEnd();
                                tr.Close();
                                fileloc = openFileDialog1.FileName;
                            }
                            catch (Exception ex)
                            {
                                MessageBox.Show(ex.Message, "Error");
                            }
                    }
                }

                    private void saveToolStripMenuItem_Click(object sender, EventArgs e)
                    {
                         try
                        {
                            TextWriter tw = new StreamWriter(fileloc);
                            tw.Write(textBox1.Text);
                            tw.Close();
                        }
                        catch (Exception saveEx)
                        {
                            MessageBox.Show(saveEx.Message, "Error");
                        }
                    }

                    private void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
                    {
                        saveFileDialog1.InitialDirectory = @"C:\test";
                        TextWriter tw;
                        if (saveFileDialog1.ShowDialog() == DialogResult.OK)
                        {
                                try
                                {
                                    tw = new StreamWriter(saveFileDialog1.FileName);
                                    tw.Write(textBox1.Text);
                                    tw.Close();
                                    fileloc = saveFileDialog1.FileName;
                                }
                                catch (Exception saveEx)
                                {
                                    MessageBox.Show(saveEx.Message, "Error");
                                }
                        }

                    }

                    private void aboutToolStripMenuItem1_Click(object sender, EventArgs e)
                    {
                        Form2 f2 = new Form2();
                        f2.Show();
                    }

                    private void contactToolStripMenuItem1_Click(object sender, EventArgs e)
                    {
                        Form2 f2 = new Form2();
                        f2.Show();
                    }

                    private void donateToolStripMenuItem1_Click(object sender, EventArgs e)
                    {
                        Form2 f2 = new Form2();
                        f2.Show();
                    }

                    private void copyToolStripMenuItem_Click(object sender, EventArgs e)
                    {
                        textBox1.Copy();
                        textBox2.Copy();
                        textBox3.Copy();
                        textBox4.Copy();
                        textBox5.Copy();
                    }

                    private void cutToolStripMenuItem_Click(object sender, EventArgs e)
                    {
                        textBox1.Cut();
                        textBox2.Cut();
                        textBox3.Cut();
                        textBox4.Cut();
                        textBox5.Cut();
                    }

                    private void pasteToolStripMenuItem_Click(object sender, EventArgs e)
                    {
                        textBox1.Paste();
                        textBox2.Paste();
                        textBox3.Paste();
                        textBox4.Paste();
                        textBox5.Paste();

                    }

                    private void openFileDialog1_FileOk(object sender, CancelEventArgs e)
                    {

                    }

                    private void button1_Click(object sender, EventArgs e)
                    {

                    }
                    }
            }






1. I am wondering how I would add a function to enable my "Start" Button to open a program from my C:\Users\ Folder. 
2. I am also wondering how I would be able to open a .txt file so that it opens to all four lines in the GUI at once. For example, when I save and open a .txt file with multiple lines and text, it opens the writing in the .txt file to only the top line in the GUI instead of all four lines.
3. I am wondering if there is some way to set a time interval from my GUI to the second program that opens up when I hit the "Start" Button, so that when I send messages through my four lines, they can send at 1-10 second intervals.

http://imageshack.us/photo/my-images/28/84971002.png

Thread.Sleep(int.Parse(TextBoxTime.Text));

Found this for the intervals between messages, but how would I implement that into my code so that my second program waits the seconds between the messages in the GUI?

You can call Process.Start() to start an executable. E.g. Process.Start('notepad.exe') will fire up notepad.
Your text is only appearing the top textbox because that is all you are telling it to do.
If you open a file and want the text to appear in more than one textbox, first store the text file in a string variable

string fileContents = tr.ReadToEnd();

and then set the textbox.Text to the string variable for every textbox you want it to appear in.

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