Its on the back of the head unit.
The Ford Focus radio is ready for aux input if there is am AUX button in that case there is a plug on the back side of the radio that was to be used with the rear DVD, this is the same radio Ford is installing in the expedition and f series truck and that is why you have the aux, in order to use that for audio input you need to add the interface, its called pie frd04-aux and you can find on most sites that sale auxiliary input or iPod adapters, just do a search for ( Ford aux input )
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NO YOU CAN'T
The '06s didn't have an Aux Jack input on the stock radios.
The factory radio does not have an aux Jack.
Not on my 2006 Uplander.
It is for AUX stuff! Goto Crutchfield.com they will hook you up, bro.