Well, what you want to do is enter the network config of the router. This is done by using one of the following addresses. You need to put it in your browser (firefox, internet explorer) just click these links or put it in the address bar like a website:
Originally posted by: Skeeedunt
http://192.168.0.1/ or
http://192.168.1.1/ from desktop computer.
SSID is the name of the network. Change to your liking.
Find "Security" tab. Click WPA-PSK. Type in long string. Repeat on laptop. Network secured.
Next, you enter the information to get in the config, username and password, whatever you have them set to. You can change the network name in the "SSID" field. Next, generate and copy one of the network keys into your laptop in order to connect to the network. If you want a manual, you can download one of the website of the manufacturer. If you want a link to this i can get it for you.