Step 1: Download and install Uplay application on your PC. The link to official download page can be found here.
Step 2: Launch the Uplay client. Login to your account if you already have one or register a new account.
Step 3: Click on the "key" icon in the top-right menu of the application.
Step 4: Enter the cd key that you would like to activate on Uplay and press "Activate"
That's it! Your game is now activated and you can find it in your Uplay library. Head over there to download and play your game!
By confirming the delivery, you agree that the order has been received.