I don't know if DM MX can create forum, but you can go to hotscripts.com click on php and find a lot of free forums you can download in any directory on your website. I would recomend forum PHPBB, but you can use any. If your website provide you a cpanel, then you can click on Fantastico and you can find there not only forums, you will be amazed how many free forums, blogs, shopping cards e.t.c. you can find there.