You can find the Re-submit button -- Open the App >> Go to Orders Page
Manually re-submit the orders to send them to AMAZON.
> After turning off the order sync button, you can validate the orders manually as per your wish before sending/ syncing them to Amazon FBA via an option to "Re-submit to Amazon" in order log.
> For past orders, you will get the status of all the orders as "Pending" once imported in our app and you need to Re-submit/ archive the order as required under order log page.
Refer the link for Import Order feature :