The "About Me" section of your profile! Write whatever you'd like here.
The "About Me" panel is edited through your Profile Settings on the main Gaiaonline Page, the "Custom" panel is edited through the Profile Editor. They both accept BBCode allowing you to make them look a bit fancier.
You can use the BBCode URL attachments to make buttons like the "Message Me?" button in the "Custom Panel"! Here's an example;[ url=google.com ] Google Something! [ /url ]
You must delete the spaces of-course, but your outcome would be; Google Something!