How do I edit an order once it is placed by the customer? – Pulse Commerce Help Center

Go to Orders > Status.
Click Pending Approval or Warehouse.
(Alternatively, you may go to Orders > Commands And Lists > Search Orders and search for the required order.)
Locate the order you want to update on the Sales Order > View Sales Order page and click Edit Order.
Edit the order details (e.g., add or remove products, update price(s), shipping address, location, etc.) as required.
Once done making changes, click Save Changes.