1. From your profile, go to "Trips".
2. Click on the "Upcoming Trips".
3. Click on "View Itinerary".
4. At the bottom of the Itinerary, click on "Cancel Reservation".
Please take note that your refund will be issued to you based on the host's cancellation policy. You can check your host's selected cancellation policy on the listing page. Also, note that the service fee is non-refundable on cancelled bookings.
View the Cancellation Policies here.