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Activating CD key from your physical copy of the game on Steam

Store.bistudio.com Game activation
  1. Launch the Steam client software (or download it first at https://store.steampowered.com/about/) and log into your Steam account.
  2. Click the Games Menu.
  3. Choose Activate a Product on Steam.
  4. Enter your CD key and click Next.
  5. Follow the onscreen instructions to activate a product and complete the process.

Please note that you can only activate your game on an account where the game has not been activated yet.