Forum moderation is done by the moderation staff of Roblox. Moderators are all adults who work at Roblox as a paying job. Admins and Moderators will have a Badge that says they are an Admin or a Moderator.
In the past, Roblox had a few volunteer forum moderators, who were also adults that were selected for the position by the staff, which is why a Forum Moderator badge was created. Roblox no longer has volunteer forum moderators and it is not possible to apply to be one.
You can help out the community by following the Roblox Community Rules and using the Report Abuse buttons to report bad behavior.