Don't go with Forumer, it has the worst reliability and downtime ever.
For remotely hosted free forums:
I recommend http://www.forumup.com
For locally hosted free forums:
You need your own hosting, for free try http://www.byethost.com
or something, either that or pay for hosting and use http://www.phpbb.com
or something for your board software.
If you are willing to pay for a license in return for MANY MANY MANY more features and a better system for your users, pick vBulletin, its $180... plus $30 a year for updates, or Invision Power Board, which has a not so good interface yet awesome admin control panel.
For more information or questions, feel free to PM me.