This cover may require some wiggling to remove. DO NOT FORCE it, it has medium sized plastic clips along the edges that lock into metal slots . When forced it will cause these tabs to break.
To Begin we need to put the chair into manual Shiatsu to move the mechanism to the middle of the track
Select Manual and then Mode
Select Shiatsu by kitting the "ok" button
Lastly select Manual , Position and point
From here using the UP and DOWN arrows in the middle of the remote HOLD the DOWN arrow and the mechanism should move down until you release the button. Make sure you stop the mechanism in area on the track where you can access the top of the mechanism .