To cancel your booking, please go into 'Renting' (top right drop-down menu) after logging into your evee account. Make sure 'Upcoming' is selected. There should be tile(s) representing your booking, click on the booking you wish to cancel. In your booking details page, underneath the booking dates and times, there will be a button to cancel the booking.
Please note, if you cancel your booking without good reason, evee's Cancellation Policy will apply.