Your profile contains information about yourself, your interests, as well as things like your signature, etc.
To edit your profile, you first need to make sure you are logged in. If you are not logged in, you will not see the option to edit your profile. To edit your profile, go to the discussion forums and choose the Users/My Profile option at the top of the screen. From there, you can go through the various screens that contain your profile information.
One of the cool things is to put your location on the map. You can find this on the "Personal" tab in your profile. Basically you just zoom in on the map and click where you are located and it will put a "pin" there. It is neat to see where all the Capris are located.