Dodge 2010 Caliber Owner's Manual page 173

172 UNDERSTANDING THE FEATURES OF YOUR VEHICLE
To install the Cargo Cover, insert either end of the cover
into one of the two notches located in the rear trim
panels. With one of the cover ends installed, push inward
on the opposite end and install it into the same notch
location of the rear trim panel.
Rear Trim Notches
Using the handle, pull the cover toward you and guide
the rear cover posts into the guides located on both sides
of the rear trim panel.
Cargo Cover Guides