How do i set the channels on my car radio?

I have a '85 buick lesaber with the orginal radio in it. it has the standard 1-4 preset buttons, a tunning knob, and scan and seek buttons, but there is no "set" button, so i dont know how to change the preset stations, or the clock. It also has a button that says "DNR" which i dont know... show more I have a '85 buick lesaber with the orginal radio in it. it has the standard 1-4 preset buttons, a tunning knob, and scan and seek buttons, but there is no "set" button, so i dont know how to change the preset stations, or the clock. It also has a button that says "DNR" which i dont know what it does.
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