Even if you are not connected to the internet you should be able to open the Belkin web page interface using address 192.168.2.1.
Are you able to open the web page if you connect using an ethernet cable as opposed to wirelessly?
I had a problem with a Belkin router where the instructions in the manual for re-setting the unit were wrong. To reset my unit you needed at least three hands! The reset button had to be held in while you switched on the router.