You can assign a site moderator or an administrator only via the Control Panel.

1 To assign a moderator to the forum log into Control Panel through http://www.ucoz.com/main/?a=login or http://site_address/admin .
2 After you have got to the CP main page go to the Forum section.
3 Click on "Management of forums and sections".
4 Choose the forum where you want to assign a moderator and click "Change" (wrench icon).
5 Find the line "Forum moderators:".
6 Click "+" near the window.
7 Enter the username of the moderator you want to assign and click "Search".
8 After the user have been found click on his/her nickname.
9 After you have clicked on the username the user will be added to the "list of moderators"
10 Save the settings and go to the forum pages to make sure that the moderator has been assigned.