Hi Yong Khang!

Under the Motorist app, go to "My Profile"

Click on the profile of the vehicle you wish to remove and at the top header, select "Manage", you should be able to see the option "Deactivate Vehicle" :)

After you have deactivated your vehicle, do send in a message to the Mel Chat to request for your vehicle to be removed and we will proceed with your request :)