Photographing

There is the shutter speed ring and the aperture ring around the lens on the lensboard.
Set the shutter speed with the ring inside, and set the aperture with the ring outside.

Focusing knob is on the side of the lensboard (circled by the red-colored circle).
Looking through the rangefinder, focus with this knob.
Distance scale is on top of the lensboard behind the viewfinder.