Note: The images in the following screen shots say "Community Server" instead of "CFAITH Communities" and may have different colors. However, the procedure is exactly the same.

Using the "Favorites" menu button, you can add a forum as a favorite by clicking on the "Add this forum as a favorite" menu item, as shown below. This will add the current forum as a favorite in your profile under the "Favorites" tab.

 
Your profile has a "Favorites" tab that shows forums you have marked as a favorite.