I just did this today on a '96. There is a screw at the bottom rear. Remove it, and you can slide the cover forward, then pull it down to remove.

That's the easy part. Your challenge will be re-installing. You need to get all the tabs "started" and then push to the rear. With the cover off, you will see what I mean. You may need a helper to press in on all the areas where the tabs are located.

Fortunately, the door liner is fairly easy to R/R if you need to do that.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe