which buttons are you on about

if its the grey ones in the trim, they just push in.
but be carefull getting them out, as they mark very easily and look crap when you put them back in.
you can but a tool to do it with its a bit like a small lever bar that has a slit in it.

if your buttons look like a big screw head then use a 50 pence peice to turn them half a turn and they should pop out.