No latch on your mailbox? No problem - Simply align Mail Time! on mailbox with door closed. While holding in place, open door and allow flag to open. While holding in place, insert machine screw through hole. Do not bend the yellow tab, as aluminum is not made to be bent and it can break off!
Mail Time! is designed for mailboxes where the door closes over the face of the box. Mail Time! is not designed to fit on mailboxes where door is flush inside the mailbox, such as these styles: