What is correct URL/way to connect to a project?

I just signed on, my domain is in the process of being transferred (I hope), and I just uploaded my first project using 'Project/Copy Project' in VS 2003. I successfully copied and mapped my database, which I verified by changing some of my data on the DiscountASP server and running my project locally. I have been developing and testing it overall for a few months, so I know that the problem is settings-related, not in the code.

When I try to connect to my uploaded project via a browser, at 'http://myUserName.web125.discountasp.net', I get the 'Web Page Unavailable' message (the title of which, by the way, is incorrectly named 'Webage Unavailable').

I did manage (once) to connect 'by accident', as I got to my login page, but now that I'm trying to test whether my updated settings in web.config, setting customErrors mode='Off', I can't find my project again.

Since I can upload files fine (as far as I know; don't yet have the hang of the Control Panel), I know that the basic address is correct, so I can't assume that once my domain name transfers that I'll be able to access it directly then, either.

This is my first time with an ASP web app; my previous experience is with straight html and/or Flash. Is there a change that needs to be made to the web.config to include the new hosting address? I didn't upload to a custom directory as of yet; just straight to root.

Thanks for any and all help you can provide.