Editing your MP profile page is a piece of cake. All you need to do is login to MP using your username and password, and you'll be taken to your Control Panel (see below).
Everthing is very self-explanatory. You can edit your profile with absolutely no programming experience whatsoever.
Want to upload some new artwork? Just click on the artwork icon.
Want to post an event on your calendar? Just click on the events icon.
It's really that easy.