Just click the Games icon on your desktop to open the app.
If you don't see the icon, open the Start menu by clicking the Windows icon in the bottom left corner of your screen, then click All Programs or All apps, and open the Game Manager program.
On your MAC OS, in the Dock, click "Applications" in the sidebar of the Finder window, then double-click on the Game Manager icon. It may also be located in your Games folder.