Are you using a 920 or 920+? The CGO-4 used on the 920+ actually has more manual control features than found on an I-2.
With the 920+ all the camera controls and settings are accessed using the tool icons on the right side of the ST-16 screen. In those tools you will find features including shutter or aperture priority, ISO, and f stop.
On the left side of the screen you have a tool to adjust focal length, while tapping the screen will adjust point of focus.