Did the receiver come with the MCACC microphone? If so, you should run the software set up routine. It would recognize the sub and set it's levels. If not, page 40 of the manual covers a hands on procedure to get things going.
Also, there's a "System SETUP" front panel button, that allows you to access the menu. This will display settings on the front display. Use the "Multi Jog" knob to scroll through the settings.