To change the asking price of a vehicle that has been listed, log in to your account.
To reduce the listing amount, move the slider and click 'Reduce asking price'. Your new asking price will now be shown to any potential buyers viewing your listing.
To increase the amount, you'll first need to decline any current offers by clicking 'Not Interested? Decline', located in the bottom center of the page. After declining the original listing, you can make updates to the vehicle and re-list the vehicle for your new asking price.