Not 100% sure this is what you are asking about but if it is, here you go.
https://support.chess.com/customer/en/portal/articles/1444894-how-do-i-turn-on-off-my-vacation-status-
Not 100% sure this is what you are asking about but if it is, here you go.
https://support.chess.com/customer/en/portal/articles/1444894-how-do-i-turn-on-off-my-vacation-status-
Can't find any button.need answer quickly