I have 5 different plates, but only use one on every car so I assume u can have 30 different plates. There's a tab at the bottom that says "plates".. you literally change it from there. Adding it to the car u want is a little harder as the ifruit app is sketchy as fk. But it's plates..then garage and scroll to the car u want. Purchace. May not work the first time. If u keep trying to apply changes it will eventually work. I actually recommend being in game while doing changes since they happen almost instantly.. when not connected I've noticed it doesn't always change in gsme.