To redeem your Steam CD key, follow this Steam activation guide.
You will require a steam account and the game client, the Steam game client can be downloaded here: https://store.steampowered.com/about/.And you can create an account here if you do not already have one: https://store.steampowered.com/join/.
Launch the Steam client and login to your Steam account.
Click the games drop down menu in the top left then choose “activate a product on Steam”
Follow the onscreen instructions to complete the process and add the game to your Steam library.
No products in the cart.