I got a call from New York. Lucky Luciano wanted my help in getting The Kid on his side. Piece of cake, he said. I wanted Luciano's connections in the Big Apple, so I agreed. What I didn't know was that The Kid didn't want to be on Luciano's side. That was how the trouble started. Piece of cake? I never did like cake.
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