1) Switch on your adapter via the keyboard/fascia button *before* you log in to your User Account.
2) Click on the WLAN icon in the NA. Refresh the network list.
3) Select your SSID and click the Connect button. Enter your WPA key twice (you should have configured this setting in your router).
4) Make a firewall permission when your client firewall prompts you (which it will at this point unless you run it in auto mode).
5) That's about it.