TalkModerators oversee specific forums. They generally have the ability to edit and delete posts, move threads, and perform other manipulations. If you have a question about a particular forum, you should direct it to the TalkModerator for that forum. Not every forum will have a TalkModerator, so feel free to contact email@example.com.
Becoming a moderator for a specific forum is usually rewarded to users who are particularly helpful and knowledgeable in the subject of the forum they are moderating -- although there are some who have claimed we don't have a clear understanding of the term "reward."