If you just want to replace the armrest, lift it up and underneath should be a plastic cover. On this cover there should be 3 (or 4, cant remember) little black plastic covers which cover up the screws, these will undo the arm rest. If you want to take the whole section out it should also only be 4 screws. These are (x2) under the hazard light switch (so you'll need to pull that out) and (x2) under the ashtray in the back.
<img src='http://img.photobucket.com/albums/v225/2ndclasscitizen/martinmkcsig.jpg' border='0' alt='user posted image' />
<span style='font-size:9pt;line-height:100%'>It's better than doing crack.</span>