According to the manual I linked to above, the console path would be:
http://2wire.gateway.net
(Since it's acting as the default gateway it can trap that address)
Now the password is a different matter...
Although page 13 does tell you how to reset it if you need to.
Ohh, and page 79 describes the device list I mentioned above.
Ps. If after checking the connected devices, you still feel the need to lock down your router then you need to do two things.
First stop broadcasting your SSID and second enable WEP encryption. Seach the manual for "SSID" and "WEP" for details.