When you create a board, you automatically become its administrator and, accordingly, its first moderator. You can then add other users as moderators and do other cool stuff. Visit the board management page to check all the functionality.

If you want to moderate an existing board, then you need to ask the board administrator to add you. If existing moderators need help and you prove that you can be useful, they can add you to the moderators.

If the board administrator and moderators are not active, then you can become the board administrator by buying its coins and voting for yourself, or you can post on the board and ask the coin holders to vote for you. At the same time, tell the holders why you want to become the administrator of this board, and how you see it. It is quite possible that the coin holders of the board will like your vision and they will choose you as an administrator.