Once opening the JustPark app, click on the top left corner of the screen to open this page. Here, select 'My Bookings'.
On this page, you should find all your upcoming bookings. Select the one you wish to cancel.
Scroll down to find a few actions you can take. Make sure you click on 'Cancel' which is highlighted in red, as shown below.
After this, you will be asked to confirm the cancellation by clicking 'Yes, cancel my booking'.
Next, you will be offered to add any additional comments. If you do not wish to do so, simply proceed to 'Cancel Booking'.
Finally, you should now be at the screen shown below. Your booking will have successfully been cancelled.