94 Eldorado, and a 99 ETC
Go and grab a flathead screwdriver, then pry it up gently around the edges. It uses metal snaps to stay down. Once you've got it loose, put your heavy foot on the brake petal, and shift the car into neutral. The engine does not have to be on, in fact it's safer to leave it off. Then turn the trim peice sideways to get it around and off the shifter. After that put it back into park. Then you can unplug the lighter outlet and the trim peice will be free from the car.