Hey, good morning. Some manuals can be frustrating, but the receivers sure are nice!
Input Modes
I see in the manual that there is an input mode button on the remote control. It's on the rear, and it's labeled, "INPUT AUDIO". It shows it on page 7 of the manual, and the description of that button gives the page numbers of where that function is discussed.
Surround Modes
The surround mode buttons are directly above the input mode button on the rear of the remote and are also shown on page 7.