Choose how you want to handle scheduling with Clients.
Open the menu (top right), go to Profile, then Scheduling. You'll find one setting: "Use an external calendar link for scheduling?"
Turn it on to add a calendar link to let Clients schedule their own appointments. Clients receive the link automatically after they pay a deposit or Book a Wanna Do, so they can pick a time from your availability instantly. Add your link, then tap Save.
Leave it off to coordinate scheduling yourself. You can chat with Clients right after they Book to find a time that works.

