If you notice an error on your shipping label you can easily repurchase postage to get the label updated properly! Open the tertiary menu for the order that you need to repurchase and select "Recreate Label". You must complete purchasing the label without leaving or refreshing the page or you will have to wait a full 7 days for the order to be refunded to your account.
The Shipping Label modal will open and you can make any changes to the customer's information, printer option, ship date, or postage type. Once you have the order information correct just choose the postage type to get the label purchased again!