You can set another player to supervise the account during your absence. To do that, go to Settings > Account sitting, fill the player's name and confirm your action with your password. Over there, you'll have the option to select a player as sitter and select which actions he or she will be able to perform during this time. Please be very careful with the actions the sitter will be able to perform during sitting. It might end up with actions that you don't agree and might harm the account.