Hello there,

Thank you for reaching out to us.

You need to add a customer panel placeholder to your appointment-approved notifications like this for example 

And when they book for the first time and when they click on the link they will be redirected automatically to set the password and the user name will always be the mail that they used during the purchase.

You need to do this also for customer panel access as well copy and add this %customer_panel_url% there and when they forgot password they will be able to reset it.

This should help.

Should you have any further inquiries, we kindly request that you open separate tickets for each question and we will gladly help you there.

We wish you all the best.

Have a nice day.