A moderator is an administrator
On An online forum there are often 1 or more moderators. The moderator can adjust messages and responses from other people if they do not adhere to the rules. The moderator can manage the discussion by ensuring that people remain on the same subject, that no inappropriate language is used and that people keep respect for each other. It is also possible for a moderator to give answers to questions, because it is often someone who has a lot of experience or knowledge about the subject.