Once an order is confirmed, this Order moves into the "Order History" tab.
Here, Admins have the ability to make edits to order after the order has been confirmed for up to 7 days (e.g. if some stock was confirmed incorrectly).
On the left hand menu select "Orders"
Select "Order History"
Select the order you would like to view for by clicking the arrow →
Make any required adjustments and click "Save"