First of all, you should download Uplay application on your PC, download can be found right here.
After you download and install Uplay client, a login screen will appear, if you don’t have Uplay account you will need to create one if you do it’s just a matter of logging in.
After logging in, on the left side you will see the menu, after clicking on it, click on “Activate a key”.
After clicking on “Activate a key” you will see a new window open up.
In this window, after your Activation key and just press “Activate”.
After that, you are finished, you can find your game inside Uplay library, if you are looking for more games, visit gamecamp.gg to camp for the cheapest prices of your favorite games.