Lost DHCP pasword

Hello,

Please, someone, i need help.
I've been atempting to turn on my DHCP (Dynamic Host Configuration Protocol), and to do this i need to enter 192.168.0.1 into the web search. It has asked me for a username and pasword before i can enter this page, however I don't know what they are and need help finding them.
Iv'e asked BT, but they are totaly useless.

Someone, anyone out there must know how to help me...