I am having trouble connecting the ps3 to bt wifi. I have tried using automatic ip and fixed ip (using the details for default gateway etc that I got from ipconfig on my pc). The ps3 seems to obtain an ip address, but when I go to the browser, I just get a white page, so cannot see the login forms!
I don't have a PS3 so can not give first hand advice but I would try a factory reset of the homehub by pressing a pin into the recess button on the rear for about 20 seconds. This can sometimes sort out any configuration problems. Once it restarts follow the suggested method to connect in the previous link I posted.
If your broadband is not activated, your primary email address and password will also not be activated and you need that to log onto BTWifi unless BT have given you a temporary one.