How would you remove the headlight knob on the dashboard of a 1989 Chevy Celebrity?

Take off the bottom of the panel below the steering wheel the one to the left if you are looking at it. Pull the knob all the way out, so the lights are on. Put your hand up in the dash board, on the right side of the light switch there is a little button. Push it in and pull the headlight knob in and out a few times, until it comes out. Unscrew the little plastic screw that holds the dashboard panel to light switch. I did this when i had to put in my head unit (CD player) anymore question email me

When pushing on the button push the knob in slightly until the button goes in farther, then pull out. A black permanent marker works wonders to cover up scratches on the plastic piece holding the panel to the switch.