If you can't get to the control panel, Sue, try putting in the words "admin" and "password" when it asks you for username/password - they're the standard defaults. When you get on to the main screen, you may need to hunt around for the page referring to the password necessary to connect to the Internet - that's the one you need to add.
If that doesn't work, I'd go along with Tizzabelle and ring the BT tech support guys.
The Hubble Telescope has just picked up a sound from a fraction of a second before the Big Bang. The sound was "Uh oh".