You can create a new post or I wouldn't be able to see this. You can't create a new forum, but you can create a new thread. Just click on the "post new thread" button in the top right.
I don't have the Post New Thread button to click on. all I have in the top right is my User Name Inbox and Alerts.
You have to be in the forum view to see the button and post a thread. You can't do it from within a thread.