Hi there - I'll see if I can help you out.
You need to find the default IP address / gateway of your router.
I run a Belkin and to get into it's settings/configuration I open a browser and put 192.168.2.1 into the navigation bar.
I think the default IP address / gateway for all the later Linksys routers is: 192.168.1.1 Open Internet Explorer / Firefox / Opera whatever you use to browse the web, and type this into the navigation bar. Does this access your router?