Please first make sure you have a version of the game registered to your account. To do so, click "register" in the menu bar at the top.
If you are convinced you already have a version of the game registered to your account, please contact the helpdesk via the link next to "register".
Once you have a version of the game showing next to your name on the forum, you will have more access to the forum, like for example to the Content Creation Support forum.
Without a version of the game showing next to your name, a lot of people will ignore your posts, so it helps in getting help.