Hunt the wildest beasts of Mordor as you battle new monsters, earn unique runes, and turn deadly creatures on your enemies. Unlocks the Beast-hunter skin and Test of the Wild Challenge Mode. Middle-earth™: Shadow of Mordor™ required; sold separately.
Open the Steam client, login and locate the Games tab on the top menu. Click this and then select “Activate a Product on Steam…”
Enter your unique code that's displayed on the 'Orders' page of CDKeys.com and follow the prompts to activate.
Your game is now viewable in the “Library” tab and is available to download/install when you’re ready. You can find additional support for the Steam client here: https://help.steampowered.com/en/wizard/HelpWithSteam