This looks like a clear case of RTFM, time to read the manual that came with your router.
It is very easy to setup as you get everything you need to connect to your ISP in the box.
The easiest way to do this is(I wint give full instructions as they are in the routers manual);
1/ plug your laptop directly into the router
2/make sure your router is connected to your dsl/cable modem
3/Go to your routers home page and setup the connection
4/enable wireless
5/make sure everything works while still connected
6/unplug your laptop and turn on your wireless
7/connect to you router
8/job done.

Hope this helps a little