How do you create a custom license plate in GTA Online?

To create a custom license plate in GTA Online, one must first download the iFruit app onto their real-world smartphone. Once the app is installed, they need to log in with their Rockstar Games Social Club account, linked to their GTA Online profile. They can then customize their plate by choosing a combination of letters and numbers, although it must be unique and not already taken by another player. After creating their personalized plate within the app, players are required to place an order for their plate to be manufactured in-game. It will cost them in-game currency, and once the purchase is complete, they should visit Los Santos Customs during their next GTA Online session to apply the new plate to their chosen vehicle.