I have never tried it. but if are describing them and that they dont have screws or anything, then i would think they they would sort of pop off. Like most interior bits they should be clipped on. Im thinking they would have a latch like that of the interior door handle backings, where you have to unclip the plastic that goes under and in the hole. hard to describe.
But as i said, never tried it and im just assuming, not gospel.