Forum moderator role
From MoodleDocs
A forum moderator for a particular forum is able to edit or delete forum posts, split discussions and move discussions to other forums.
Role assignment
A user can be made a forum moderator for a particular forum by assigning them the role of teacher in the module context, as follows:
1. Access the forum.
2. Click the "Update this forum" button at the top-right of the page.

3.Access the Assign roles page via the Roles tab (or the "Locally assigned roles" tab in Moodle 1.9 onwards) in the top-middle of the page.

4.Choose the teacher role to assign.

5.Select the user in the potential users list, and use the left-facing arrow button to add them to the existing users list.

See also
- Talk:Forum moderator role for alternative solutions