You can delete a moderator, if required. Click on Manage link available in the left sidebar. The sub-links appear as below.
Click on All Moderators option in Manage Moderators link. The list of all moderators appears.
Locate the target moderator.
In Action column, click on View button. The row expands to show you the moderator details, as below.
Click on Delete button available in moderator details section. The backend system asks you confirm if you want to delete this moderator. Click on Ok to confirm it.