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On the lens there is a switch that has one side marked with an “A”, the other side marked with a ‘circular’ graphic that is supposed to represent setting the aperture by way of using the lens’ aperture ring. Make sure the switch is not set to the “A” side. You might need to move the switch back and forth a few times to make sure it is not stuck. Next make sure the camera is not in Program Mode and not in Shutter Priority Mode, that is, set it to be in either fully Manual Mode or Aperture Priority Mode — your manual should be able to help you do this. Rotate the aperture ring and you should see the f-stop number change in the display. If this does not work, you may have a dirty contact that is not letting the ring pass information back to the camera, while these are easy enough to clean, maybe have the dealer take a look to make sure nothing else is wrong. p.s. Welcome to the forum.