This must be me being stupid, but where do I enter my Wi-Fi WPA password? Whenever I want to connect up, I select the access point and then I'm prompted for my 'preshared password'.....
Where's the field where I type this in so that I don't have to do this for every single connection?
Go into WLAN security settings. There, change the WPA/WPA2 setting from EAP to Pre-shared key. Then the Pre-shared Key option will activate where you can add your WPA key.