Please follow these instructions to activate a product on Steam:
- Launch the Steam client software and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam…
Follow the onscreen instructions to complete the process.
After this step completed, you must enter your generated serial key from our (anahtar üreteç) and enter cd key here: see the image below
Ensure that you are activating your game through the Steam application. The Steam website cannot be used to activate a game. If you have not yet done so, you can download and install the Steam application by clicking on the “INSTALL STEAM NOW”