Where do I enter my promo code? Winston Xie March 17, 2018 04:47 Updated Promo codes are entered during Step 4 of the trip listing process. Related articles I need to edit or cancel my listed trip. Where is Airmule available? Where can I find my confirmation code? What are the chances my trip will get matched with a shipment? How do I know what I'm transporting? Comments 0 comments Please sign in to leave a comment.