Click on the Schedule tab on the sidebar

Change the display to Staff availably mode
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Click on one of the staff availabilities that you created
if you didn't create one here is an article to show how to do that
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Click on Book Appointment
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Choose the appointment that you want to book
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Choose one of the available hours and click on Next

If it an exciting member just choose him and use his membership plan or if this appointment has enble purchase he can buy it using his credit card
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If its a new member choose New member
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For the "New Member" Option your appointment needs to be set with the "purchase a service" toggle open
you can learn more here
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Fill al the details: First name, Last name, Email, and phone number

You will have 3 options: