To redeem the Watch Dogs 2 Exclusive Content, please click HERE. Once you access the Watch Dogs 2 Exclusive Content website, in the middle of the screen you will see "Redeem Your Code".
Once you have clicked "Redeem Your Code" you will be prompted to log in with your Ubisoft account:
Once you have logged in you will be prompted to select your platform of your choice and to enter your code in the field.
Once the code has been successful, you will see the following confirmation message on the screen.
Note: you will also receive an e-mail confirmation; this will be sent to the email address linked to your Ubisoft account.