[header] How to program the pioneer compact stereo xr p170c and 270c [title] Press the tuner/band button until an fm or am frequency is showing, whichever band you want to do. [title] Use the two double arrow buttons just below the tuner/band button to tune in the desired frequency. [title] Press the big button to the right that is shaped like a baseball home plate. 
[step] This button has opposing arrows on it. Press either end; it does not really matter.