License plate customization. How Do I Customize my License Plate? Before you start on your license plate customization journey, you’re going to want to make sure the car you want to apply the custom license plate to is out or recently driven in the game. Now in order to make and order a custom plate for your in-game car, you will need to visit the Rockstar website. Specifically you will need to go to https://www.rockstargames.com/gta-online/license-plates or can google “gta online license plate creator” or something similar, where the first link will typically be the Rockstar website link to the creator.