First, run ifconfig wlan0 up. This will enable wireless. You won't get any feedback unless there's a problem. Next, run iwlist wlan0 scan to scan for nearby wireless networks. Once you have looked at the output and know which wireless network you want to connect to, run iwconfig wlan0 essid NETWORK_ID key s:WIRELESS_KEY, replacing NETWORK_ID with the name (essid) of the nework and WIRELESS_KEY with the network passcode. Hope that helps!