DaMaster121 0 Newbie Poster

I used the following tutorial to make my login system. http://support.microsoft.com/default.aspx?scid=kb;en-us;321439 i have a error with the page, when i try and login using it, i get the error "Error is: 006~ASP 0158~Missing URL~A URL is required." Also using this system i want to make a page where users can modify there details ie change their password, how can i go about this? thanks.