Yes, you can thank a listener by replying to their message on the Gratitude Wall. You can reply from your Teacher Dashboard on the Donations tab / Latest Donations / Awaiting. Once you have replied, they will be notified within the app. Any donation without a note is marked as private by default, which means you can send them a thank you note but it won’t appear on the Gratitude Wall on the app.
Learn more about donations here.