nopCommerce allows customers to submit return requests on orders. This is a very useful feature in that it allows customers to submit and view the process of their returns without needing to contact you—the storeowner—for support. Return requests are only available for orders that are marked Completed. Only after this status is assigned to the order will the customer be able to submit a request.
Return requests are enabled by default, but you can turn this feature off via the administration site. You can also manage other settings as well. To view the return request settings, navigate to Configuration | Settings | Order Settings. On the Order settings page, click on the Return request settings tab: