Members ++ : These members have no more power than the next member, but they are recognized for buying the expensive Members ++ item in the shop.
Trade Moderator: These Moderators make sure trades are secure and fair. Contact a trade moderator especially if you ned a mediator.
Junior Moderator: These are Moderator's assistants. They can edit posts and be the eyes of something greater.
Moderator: Moderators protect the site against malicious users who violate the rules. They are also your auxillary if no Trade Moderator is nearby.
Senior Moderator: The Senior Moderators recognize and deal with the major violations of the forums. They can carry through any desired moderative action within the forums, so they should be a last resort for help requests.
Retired Moderators: These members no longer have the powers they once did, but it's your word against theirs.
Administrator: This is tramway. Contact him for password recovery, etc.