Forums are grouped into three categories: Overall Site Forums, Special Interest Group Forums, and Private Group Forums. All members have access to the Overall Site Forums. Community memberships provide access to any groups to which they belong.
Clicking on the Forums text in the menu bar displays a list of the forums to which a member has access. Recent topics are also displayed.
The Overall Site category contains three forums. Clicking on the title of any of the forums brings up the topics for that forum, in order starting from the latest topic posted.
Click on the Topic title to view the initial posting and all of the replies, descending from latest reply.
At the bottom of the replies is a form to reply to the topic. To see that tutorial, or to add your own topic to the forum, refer to the Tutorial page for their listings.