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Aux Input 2002 Nissan Xterra...HELP!?

how to I get my stereo to display AUX? (like this: http://www.higherground4x4.com/Tech/Aux-in/P1070081.JPG
I have that exact same stereo.
Is there some button combination or something? (<-- Please be something like this. =P)

I know in the guide he uses a switch on the aux cable to turn it on, but I really dont want to (and can't really) do that

I'm thinking of buying this, but I'm pretty sure that I need to turn aux on for it to play.  (or will the cable below work without a switch?)
http://www.ebay.com/itm/NISSAN-3-5MM-MP3-iPOD-AUX-INPUT-JACK-8-PIN-M-BUS-CABLE-/200535575261?pt=Car_Audio_Video&vxp=mtr&hash=item2eb0da0add#ht_1869wt_1165