Help figuring out how to adjust aperture on a Nikon D40 body with a AF-S lens?

I'm EXTREMELY new to using advanced cameras. I just got this used Nikon D40 today and it came with a AF-S lens. Now, in the manual it says that with this type of lens you can adjust the aperture and shutter speed, but I can't figure out how and I can't find it in any of the manuals or online. Help please?

Added (1). Yes I DID read the entire manual for my CAMERA. I don't have an manual for the lens.

You evidently did not read the manual very thoroughly then. Changing the aperture is done on the body of the camera, not the lens. Go back and re-read. It is in there. I guarantee it.

The manual for your camera clearly explains how to adjust those things. Try reading the whole manual.

The section of your camera manual dealing with the Aperture priority, Shutter priority, and Manual modes clearly explain how to change shutter speed and aperture using those modes.

Stop skimming your manual and READ IT CAREFULLY.

First of all, you have to be in either A or M modes. Otherwise, you can't directly adjust the aperture.

If you are in the A mode, see page 42 of your manual for an illustration about changing the aperture. You just turn the command dial.

If you are in the M mode, see page 43 of your manual for an illustration about changing the aperture. It involves pressing the ev compensation button (+/- button) while you turn the command dial.

Very easy, there's a free video lesson on aperture and shutter speed herehttp://www.mccordall.com/photography/