@Caroline105: If they have actually booked you can use "alter reservation". To do that go to Dashboard>Reservations (find the booking you want to charge) then select the 3 dots to the far right, then "alter reservation". Change the price and send to the guest. Before doing this make sure you and the guest are in agreement on this change so there are no surprises (I do this through the messaging telling them to expect the alteration request). They will need to accept the alteration for it all to work out correctly. Hope this helps.