There is a section of the forums for help topics, way down at the bottom of the list of forums. There used to be a help section up near the top, but with the new arrangement of forums, it is now down near the bottom of the list. There are quite a few threads about photo posting down there.
The ForumTechnical Assistance forum is the main forum for such help, but the forum below it, Testing, is often used for test posts when learning the technique.