Most questions can be answered in the FAQs of this forum, or by posting a question here.
Sometimes, however, you need to communicate directly with a moderator — to request a name change, for instance, or to request permission to start a thread that you think might be skirting the rules.
For name changes and other logistical business, contact a moderator. For a question about posting or other activity in a particular forum, contact the moderators of that forum. These moderators are listed in the bottom right-hand corner of the forum page.
A full list of moderators, with their forum assignments, can be found here.