If you want to send BTZ in exchange for an item, there are two ways to do it.
You can send it through a chat with the person you’re trading with by clicking the + button to the left of the text field when you are in chat with another Bun. From there you’ll be prompted to enter the amount you want to send. Confirm with your pin and voila!
You can also send BTZ in person. Navigate to your wallet and click the ‘Send’ button. This will open your camera so that you can scan the QR code of the Bun you are sending BTZ to.
Note: As of September 30, 2020 - PIN code verification is not longer required, you will instead be prompted to confirm the amount and the Bun you are sending BTZ to.