I think you’re saying you have one of those modem/router combo dealies that also has wifi capability, right?

If so all you need a dongle for your computer.

a brief guide missing important how-to’s but will give you an idea of what’s involved:

First, connect the computer WIRED to the router/modem. using command prompt, find the router’s IP address

Put that IP into your web browser and log into the router’s set up page using whatever the login credentials are.

Set up a wireless network on the router. Pick an encryption level, a network name, and a pbumword. Save your changes!

Install the wireless adapter on your computer.

click on the taskbar icon that comes up for your wifi adapter that says something like “networks found in range”. it’ll bring up a dialog for connecting to a network. YOu’ll see the one you just set up on the router and connect to it. then you give it the pbumword and you’re done!

it’s not hard, you just need the right tools Log in to see images!