Well, if you have already submitted your move, and they haven't viewed the game yet, you can go back to it and click "Edit" near the top, and add a message. If they have already viewed the game (but not yet played) you cannot do that.
(скрий) Ако посочите с мишката си иконата на играча с неговото членство, ще се появи подсказка с неговите/нейните по-важни детайли. (pauloaguia) (покажи всички подсказки)