If it is what I am thinking, he might not be able to get into his router... Is that a combo router/modem provided by your ISP?
Some companies (like Netrox.net) offer DSL for cheap and they are very good, but they send you a router/modem combo, and they DONT give you access to the router, so that they can access it from their office and fix any problems... This would suck as there would be NOTHING that could be done about this... You could always reset it to default, but some companies will cancel your account or make you pat bookoo $ to buy the router/modem to keep it... Just a thought if you are having trouble getting into your router.. I will try and see if I can find the model and go from there..
[edit] I have found your router. It doesnt appear what I feared. Go to the link below and it will download a .pdf file (the users guide, with in-depth instructions).. You really should read the whole thing as it seems pretty good. It will help you understand better what you want to accomplish, and it should also give you instructions on HOW to accomplish what you are trying to do... Hope this helps you ....
ftp://ftp.linksys.com/pdf/befsr11_befsr41ug.pdf