on some cars the arm rest is press fit on and you just force it off

on my car a 99 is was bolted on, you just need to get a wrench between the seat and the armrest and start losening it and it will come right off

- 95 Mystique LS - Zetec/5spd - 99 Contour SeVT Sport - Duratec/5spd Official NE-CEG Contour/Mustang Family