If logged in as admin (mutate ut2votelogin <password>) the Mainmenu looks slightly different (marked red):

Reject removes the selected map from the list of votable maps, without deleting the map itself. To reactivate the maps, the admin has to scroll down the maplist till it’s end, there he’ll find the rejected maps with a RZ-Prefix. After selecting a rejected map, you can reactivate it.
AddNew adds the selected map to the list of new maps.
ClanSetup will be explained on an extra side.

a full-admin is able to open the admin-menu by clicking on Admin. A lot of settings made in the UT2Vote21.ini can be changed here. Admins will know what to do here.

Clicking GameOptions opens the game-options-menu, which also comes up after clicking on Edit in the games-menu. Like the admin-menu, this menu is only accessable for full-admins and they will know, what to do here.

[UT2Vote 4.8] [Mainmenu] [Games] [Mutators] [Kick Menu] [Settings] [Top Maps] [New Maps] [About] [Admin] [Clan Setup] [Installation]