There are many reasons to want to change an item or items on a marketplace order. These can include customer requests for a different product, damaged product replacement, incorrect stock etc.
First, enter Marketplace Customer Service and make your way to the 'Change Item' button.
After clicking that button there will be a search box that pops up prompting you to find the desired item for the change. Simply search for the item and click the condition configuration (New or Used). A confirmation box will pop up. Clicking 'ok' finalizes the change.
*NOTE* Changing the item on the order will not automatically change the order price; the system keeps the original amount. If the new item costs more or less, you will have to make the appropriate adjustments in the item information area. This makes it easy to track the balance of the customer's order.