You can start Hallmark Card Studio for Mac from the Applications folder.

To start the program, double-click the Hallmark Card Studio icon in your Applications folder.

When the program opens, the Hallmark Card Studio icon appears in the Dock. To keep the icon in the Dock, Control-click (or right-click) the icon in the Dock and choose Keep in Dock (Leopard) or Options > Keep in Dock (Snow Leopard).