As stated above, use yr computer to establish the IP address of the router - by opening a terminal window and typing ipconfig /all and noting the default gateway address. It will probably be of the form 192.168.n.1. Paste that address into a web browser and you should obtain a web page sent from the router. You'll probably be asked for a login and a password - and if you don't know these, you will probably have to go for a full reset. (but try the defaults, from the instruction manual, first). If you do know the login and password, it should be relatively simple. You will probably be able to find a manual on-line from Belkin.
To reset the router, look for a small hole in the back - push an insulated probe into it and you will reset the router to its factory settings. YOU WILL LOSE ALL OF YOUR SETTINGS, so only do this if you have got a copy of the instructions and are confident in what you are doing.