I'm guessing the problem is like all DSL connections.
You have a login/password. If you plug your Router in and go through the setup hoops, it should pull the DSL login info off of the computer you had hooked up before and log in for your whole network. If it doesn't either you don't haven it plugged in properly, set up the router improperly, or you just got a ****ty router. I kinda doubt the last one in most cases.
I'm a cable advocate... no login & no resident software.