From page 30 of the Owner's Manual:
To map input jacks, first press the Input Select Button (CD in your case.). Then press Setup, INP, A-D,then source. You can prioritize the order of jacks you map to your input. Button #1 is the first priority, Button #2 the second, etc. Use the level up-down button(top and bottom pie buttons)to select the appropriate jack. You can map up to 6 jacks to your input. Press Setup to exit.
To map input jacks, first press the Input Select Button (CD in your case.). Then press Setup, INP, A-D,then source. You can prioritize the order of jacks you map to your input. Button #1 is the first priority, Button #2 the second, etc. Use the level up-down button(top and bottom pie buttons)to select the appropriate jack. You can map up to 6 jacks to your input. Press Setup to exit.