Yarwell has provided you with a link to the password recovery methods.
It is "normal" for this to be the same as a password for email etc but not guaranteed.
Assuming this is the user name and password for BB access (as opposed to user name and password for access to the router of the wireless key) then these would not originally be on the outside of the router (except for SKY were the user name / password combination identifies the router, not the account).
BT Infinity 2 - IP profile 77 / 20 - super fast!
Previously BE Unlimited - 21,000 Download 1,200 Upload but then moved house - 6,500 Down, 1Mb/s up - gutted!
Ex <n>ildram , been to SKY MAX - 15,225 Download