Navigate to Network --> Wireless
Click on "Scan" next to your client adapter.
Click on "Join Network" next to the desired network (AP).
Modify configuration if necessary, tick "Replace wireless configuration".
Save/Apply
Navigate to Network --> Wireless
Click on "Scan" next to your client adapter.
Click on "Join Network" next to the desired network (AP).
Modify configuration if necessary, tick "Replace wireless configuration".
Save/Apply