|In any case, you must read the routers manual.|
I'm abolutely sure, there is a chapter describing, how to configure the wireless router correctly and secure and what you have to configure your laptop.
Without going into deap details, your routers wireless network needs a network name (called SSID).
To secure the wireless network you need to choose the encryption type (WEP, WPA, or WPA2). Recommanded is WPA2.
Then you need to enter an encryption key in the wireless settings.
The SSID and the encryption key are also used for any device (computer, laptop, xbox or whatever), that should be connected wirelessly.