Stupid damn computer and router

Hello,
i am having major difficulties with trying to access the internet from my laptop thru my sisters computer.
i have a wireless linskeys router and my sister had DSL. this router was given to her, she has no cd for it so we have to download the program from the internet to even use it. she has no place in her modem to even hook up a router and the connection is a USB port anyways. i know there is a way to do this and i am not very smart in computers so, i ask for your help. i think i hook up this router to her computer since she is the one with the internet. i dont even know how to go about doing anything. very very frustrated and since i know there is a way to do this "gheto or not" i refuse to go buy a new router. PLEASE HELP!