If you don't already have CS:GO, you will have to download the game from Steam by pressing “Install.” Once it's downloaded on Steam, open it and click “Play.” You can now play Counter-Strike 2!

If you have been selected you will receive a notification on the main menu of CS:GO. When you see that invitation select "ENROLL" and Counter-Strike 2 will begin to download. When the download is complete launch CS:GO and select the "Limited Test" option to play the Counter-Strike 2 Limited Test.