I happen to have the Manual for that router (must have come in contact with that model at some time).

I keep my Manuals in Calibre

At your PC: Open a browser:
type
192.168.1.254 into the address bar.
OR
http://gateway.pace.com
(the password is printed on the label)
DO NOT EVER POST that
That should allow configuration (Be careful

, write down any changes and keep those safe)