There are 2 ways you can register on the forums, 1 is by registering on the main site (by clicking here) and 2 is to register directly on the forum.

If you register on the main site you will have access to your main site profile which gives you the ability to upload galleries and videos, add favorites, post comments below any video or gallery you like and edit your personal profile. Once you visit the forum while logged into your main site profile your forum account gets automatically created and you can start posting on the forums right away.

You can register on just the forum but this means you wont have a main site profile so I advise you to register on the main site and then visit the forums.