Jeff,
I looked at the owners manual for your reciever at denons website. You're right, it's laid out pretty simple on the bottom of page 27. If you are not seeing the same thing I would think it is one of two issues, the software is not right or you might actually have a different model. Just to be sure, make sure your unit has the right model number in the upper left corner of the front. (my old 2802 came with a 3803 manual, I had to have the store get the right one for me). If that's correct, make sure your menu is the same as the one in the manual (bottom of page 27).
If not try emailing Denon's tech support at: mailto:contactservice@denonnj.com
Or call them at: 800-497-8921 Option 2-6-2
You may have better luck by email, when I had to call them, I waited over an hour to get to someone.
AVR3803 Manual PDF