This box defines the race and allies for a player as well as the zip file if they player receives their RSTs zipped.
The dropdown listbox shows the available (unchosen) races. The list of checkboxes on the right show the selected race (privateers) greyed out - you can't be an ally with yourself! Simply check the checkboxes next to all the other races this player is allied with.
Note: AutoTroll will send RSTs to a player for his race and all his allies. So in the above example, this player would get player5.rst, player2.rst and player8.rst