To activate your game on your Rockstar Social Club account, there are two methods you can use. The first method is to use the Rockstar Games Launcher application. Here are the steps:

1. Download and install the Rockstar Games Launcher application.
2. Sign in to your existing account or create a new one.
   
3. Click on the icon located on the top right side of the screen, then click on the REDEEM CODE button.
   
4. The Rockstar Code activation window will pop up. Paste your game code in the designated area and click the CHECK button.

The second method is to use the Rockstar Social Club website. Here are the steps:

1. Go to the Rockstar Social Club website and register or sign in to your account.
   
2. Click on the Use Rockstar Code button for the product you want to activate.
3. The Rockstar Code activation window will pop up. Paste your game code in the designated area and click the Activate button.