Item codes can be redeemed in two ways. Firstly, via the shop from the in-game main menu:
- Open Drive Buy and log into your account
- Head to the 'Shop'
- In the lower right hand corner you'll see a 'Redeem Code' button
- Enter your code
Alternatively, head to account.drivebuygame.com, login and select "Redeem Code" from the menu.
... And voila! It's time to customise your ride!