The rules for the forum are pretty simple. When registering, use your ingame main character name and you will be given appropriate rights according to your standing with the corp. Any corp or individual with a +5 in game stading are automatically Corp Friends and anyone with at least a neutral standing are automatically Community Members. All other ranks are associated with the ranks system within the corp itself.
Here is the link to the forum http://wmbcorp.freeforums.org