Once you are signed in on the JustPark app, click on the top left corner and select 'My Bookings'.
Here, you should see all your upcoming bookings. Simply select the booking on which you would like to change the vehicle to be parked, as shown below.
After selecting the booking in which you would like to change your vehicle, scroll down the page until you see the subheading 'Vehicle' and 'Change'.
Please note if you have a booking with us at one of your local council car parks, we cannot change the vehicle associated with a booking once 5 minutes of a booking has elapsed. If more than 5 minutes of your booking has passed, just make a new booking for the correct vehicle and contact us on firstname.lastname@example.org to request a refund of the booking with the incorrect vehicle registration.