If the reservation comes from a channel:
You can cancel the reservation via the Airbnb/Vrbo/HomeAway/Booking’s dashboard only.
You should keep in mind that when a cancellation is initiated by the host, fees may be applied. Check the Airbnb and Vrbo/HomeAway Cancellation Policies to learn more about the specifics of the procedure and the cancellation fee.
If the reservation was created manually via Hostex:
You can cancel it at the bottom of the booking details page.