Start by heading over to your calendar tab
Click the lines on the top right corner
Select "scheduling settings"
Set the number of bookings you will accept per day, as well as how long you'd like each booking to be.
Adjust the amount the number of hours beforehand that a client can book a session and how far out in advance.
Give yourself a good amount of time before and after a session to avoid an overwhelming day or overlapped bookings.
Hit Save and you're all set!