If you manage to secure a valid Steam key, follow these steps to activate it: Open the desktop application. Click the "Games" menu at the top of the window. Select "Activate a Product on Steam..." .
A Battle Los Angeles game activation code is a unique 13-digit code required to activate and play the game on your PlayStation 3 console. The code is usually provided with the game purchase, either on a sticker inside the game case or via email if you bought the game digitally.
Enter the key provided with your purchase and click "Activate" or "Confirm". Troubleshooting Activation Issues