Go to the “Orders” overview in the backend (Path: Tab “Commerce” > “Orders”).
By clicking on the operation "Edit" you will be led to a details page and can change order details, such as the billing information, order items, and also allows you to set other adjustments.
Make sure to save the changes. Once saved, you will be taken back to the overview.
If required, you can trigger the order confirmation email for employers again by choosing the option "Resend receipt" in the operations column of the “Orders” overview.