Click the order number that you need to modify.

Click the "Keep Current Address" field or change the address, if necessary.

Select if you would like to charge a packaging fee or not.

Select if you or the customer will pay for the change.

This page will show the difference in price. Once you have checked it, click "Charge".

The new order will show the updated shipping and will have an "A" at the end of the order number to indicate it has been modified.

Modify shipping class