If the entered email is non-existent and therefore has never arrived at its destination, it turns purple and ends up in the standby emails (along with emails not delivered for other problems such as a full mailbox). In this case, you can modify the email on your own.
If the email remains black like the others, it means it exists and has arrived at someone, and at that point, it cannot be modified on your own.
Send the request to BookyWay support, indicating the wrong email and the correct email, and the change will be made with the deduction of a credit within 2 working days.