Jeep 2011 Liberty - Manual (Page 211)

Then, insert the spring-loaded post on the opposite end
of the cover housing into the attachment point on the
opposite side of the vehicle.
Next, grab the cover handle and pull the cover toward
you. As the cover nears the liftgate opening, guide the
rear attachment posts (on both ends of the cover) into the
notches in the trim panels. Then, lower the cover to
position the posts into the bottom of the notches and
release the handle.
Installing Retractable Cargo Area Cover
Positioning Retractable Cargo Area Cover
3
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 209