If you are trying to get in contact with the buyer of your item, you can do that directly via the GearUp platform and our message system.
You will want to first head to My Profile > My Sales. Once there, you will want to locate the specific order and click on the three dots at the upper corner of your listing and then tap the Message Buyer button. This will allow you to message the buyer.
If at any point you wish to keep the communication going or any further questions come up, you can head to your Messages button at the upper right-hand corner of the My Profile page!