I think the person is referring to this in the very first post in this thread:
"To change these router options, we're going to be using the WRT54G's Web based Setup pages. Most routers have a tiny built-in webserver you can just point your favorite browser at, login, and make whatever changes you need. On my router, I simply use http://192.168.1.1 (which is just the router's LAN side IP address). This is pretty standard on most Linksys routers. Other manufacturers might use http://192.168.0.1 or http://192.168.2.1, for example. Consult your pesky documentation for what you should use on your router. ...."
All I can say is what is said above: consult the documentation for your router for the correct address, name and password. If you no longer have the actual manual, maybe go to the manufacturer's website to find an online copy.
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