You should be able to go to the FORUMS link at the top of the page and click on into any category, thread, or post that you see. If you're "not allowed in" you won't be able to see the item (as far as I know there's only one "hidden" thread for paid members).
Handy tips include the "New Posts" item on the second red bar from the top (everything since your last login) or a couple items over under "Quick Links" is "Today's Posts."
When you see threads that you've already visited and don't want to scroll through several pages to see what happened since your last login, the

icon next to the thread will take you to the first unread message.
Have fun on the forum!