If you have not yet shipped the order and the buyer says they cannot receive the order at the address they provided originally, you should cancel the order. The buyer can then return to Amazon to place a new order using the correct address. Amazon’s policy requires sellers to ship only to the address provided in their seller account.
If the order information cannot be confirmed on the Manage Order page in your seller account, the order maybe in the Pending status or may have been cancelled. Once the order is completed, the information including Ship To address will appear and can be viewed in you seller account.