Link to a official instruction manual, how you can setup access to your home wifi, in few and well understandable steps.
http://www.raspberrypi.org/documentation/configuration/wireless/wireless-cli.md
The WIFI stick was detected from my linux automatically without problems.
Maybe a little bit better is the following explanation:
http://weworkweplay.com/play/automatically-connect-a-raspberry-pi-to-a-wifi-network/