The knurled ring in front will change the shutter. Because the IIIc "couples" aperture and shutter speed, the aperture will change as well. To change the aperture without altering shutter speed (and I suspect this is the basis for your question), you lift on the small silver tab at the bottom of the lens and move it to change just the aperture.
There should be aperture markings on top as well.
Some very early Retina IIIc's did not have them on top..
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