ok inside /etc/wpa_supplicant.conf
you should change two things

the ssid and psk
ssid is your wireless network name
the name that you see when you search for wireless networks using your laptop or your ******************************.

and psk is an encrypted combination between ssid and passphrase, you can generate PSK value using this url

http://www.wireshark.org/tools/wpa-psk.html