If you have added the wrong player to your reservation, removing him is very easy.
Steps to remove a player from a reservation
Go to your reservation and click on "edit"
Click on the red cross that appears on the profile of the player you want to delete
IMPORTANT:
Remember that if you have split the payment and deleted a player from the match who has already paid, the money will be returned to them in the same payment method, and you will assume the debt.
Keep in mind that if you are the owner of the booking, (that is, the person who made the reservation) you can not delete yourself from the reservation. The only thing you can do is to cancel the entire reservation via app or contacting the Club.