In the GUI you can't see the password.
So once again, open a terminal to the local system (you need root to access the file the passwords are in.
Go to the directory:
And then look at the contents of the wpa_supplicant.conf file.
network={ ssid="h4x0r1337" psk="secretpassword" key_mgmt=WPA-PSK priority=8 frequency=2412 }
So there you have it, the password :)