Settings

Turn the aperture ring indicated with the yellow arrow to set aperture.
And turn the shutter speed ring indicated with the red arrow to set shutter speed.
Note : For setting the shutter speed ring to "B", depress the shutter speed reset button (encircled in the figure above), and at the same time turn it.
The blue arrow indicates the depth-of-field scale. This lets you know a rough idea of depth of field matching to the set aperture value.