When you are the active player, you, and you alone, have the option of performing an additional action before your chosen die’s action. The Action Slot where you place your die shows one of the six icons you may take as an Optional Action. For instance, placing a March die on the Recruit slot means the active player alone can perform a Recruit before performing their die’s March. You can only choose your optional action from the remaining open slots, and not those already covered up by a die from a previous player.