Connecting to the internet?

-i just got my modem from AT&T..i set up the modem exactly how its suppose to. and when i open a web browser, it should automatically go to the at&t page for me to enter some information..however the page keeps goin to a page saying "unable to connect to server" how can i fix this?wow , check your network adapter cards, be sure the drivers are installed. did you setup your encryption? In the lower right hand of your computer can you click there in the navigation pane and find your list of available networks? If you can , can you connect to yours?
Call AT&T. They may not even have the service started yet.