Appointments are confirmed by you in two ways: auto-confirm or manual confirm. When adding your services (My Profile > Edit > Services), you can choose which services auto-confirm and which ones need to be manually confirmed.
Auto-confirm: This works when you want to instantly confirm a booking when a client books. When an appointment is auto-confirmed, clients instantly receive a confirmation email and text. They will just show up at the time they booked!
Manual confirm: This means you have to go in and manually confirm every booking that comes in for you. You can do this from the Appointments or Calendar tab. For any booking that needs to be confirmed, you'll see a brown Confirm button in the top, right-hand corner of the booking. When you hit Confirm, the client will receive a confirmation email and text.