Chrysler 2008 PT Cruiser - Manual (Page 216)

2. Twist the knob on the underside of the panel and
lower the shelf leg.
3. Install the shelf leg into the liftgate latch area as
labeled on the rear scuff plate.
WARNING!
Do not load objects over 100 lbs (45 kg) in position 5
(table). Failure to follow this warning could cause the
shelf to collapse resulting in personal injury.
Rear Shelf Leg Release Knob
Rear Shelf Panel Position 5
214 UNDERSTANDING THE FEATURES OF YOUR VEHICLE