The method that I have found to be easiest is


1. From root shell run "kwifimanager"
2. From settings select configuration editor
3. Enter your ssid in network name
4. Check use encryption and enter password
5. Select the configuration where you entered the information and press the activate button
6. Press the ok button to close the configuration window
7. from root shell type in "ifconfig wlan0 up"
8. from root shell type in "pump -i wlan0 to get dhcp address.

You should be good to go