You can quickly change the order information when the order is unpaid and unlocked. To edit the shipping address or shipping labels & barcodes (for platform orders), you can go to order’s details and update. To change product’s information such as design, product type, color, size or shipping method you will select the order -> action -> match product -> update. Here you can also delete out any items that you do not want to fulfill.
If you change the design, click to the red cross above the design then upload the new one.
You cannot change the quantity once the order is in-production.
You cannot add more items into a created order.