Opel Automobile Owner's Manual page 56

56 Storage
Completely pull out the rear carrier
system until it engages.
Ensure that it is not possible to push
in the rear carrier system without
pulling the release lever again.
9 Warning
It is only permissible to fit objects
to the rear carrier system if the
system has been correctly
engaged. If the rear carrier system
will not engage correctly, do not fit
objects to the system and slide the
system back. Seek the assistance
of a workshop.
Pull up license plate holder and fully
insert the holder supports into the
retainers.
Install the tail lamps
First remove the rear (1), then the
front (2) tail lamp from the recesses.
Open out the bulb holder on the back
of the tail lamp completely.