When a payment has already been initiated, it is not possible to edit any of the details.
Additionally, It is not possible to change the cryptocurrency address once your payment has been approved. Once the cryptocurrency is sent, we have no more control over it, and our part in the transaction is over.
Please note that it is only possible to cancel your transaction if it is still pending. After the cancellation, you can issue a new payment with the correct cryptocurrency address or the correct details if you wish.