Send a message to the merchant’s customer service.

If the express has not been sent yet, you can call the recipient and ask the recipient to help modify it based on the sender's information.

If the express delivery has been sent, you can call the express delivery customer service and ask the customer service to modify it with the sender's information, such as mobile phone number.

If the express delivery is in progress, you can call the delivery person and ask the delivery person to help modify it based on the sender or recipient's information.