If you don't know how to unlock a Reward via the Uplay application, please follow the below steps:
1. Open the Uplay PC client and select the Games page. Once you can see your games, click on the game tile of your choice.
2. From the Overview page, head over to Club rewards.
3. There, you should see the available Rewards for the game. To unlock a Reward, simply click the button Get it for....
4. Once you have unlocked the Reward you should see a green marker to show it has been redeemed and instructions on how to access the Reward.