Been having issues with securing my airport express. Anyway, I have found this in the help section:

1.To password-protect your AirPort network:
Open AirPort Admin Utility, located in Applications/Utilities.
2.Select your base station and click Configure. Enter the base station password, if necessary.
3.Click Change Wireless Security and choose a password scheme from the Wireless Security pop-up menu.
4.Enter the password all users will need in order to join this wireless network.
5.Use the Encryption Type pop-up menu to determine the kind of encryption for your network.

So far so good. My problem being what likely is my password for the base station cos I dont have a clue? Does anyone know if its defult or how to reset?