Once Hiro 4 is installed, there are two ways to access his morphs.  One, directly in the Properties Dials of Michael 4.  Spin the dial to 1 to morph M4 to H4.  Second, the Hiro 4 icon in the Figures>DAZ People folder of your library.  Create a blank scene and click on the icon to load the fully morphed H4 model.