Porsche Cayenne 2009 Owner's Manual page 212

Inserting and adjusting tie-down rings
Tie-down straps or the luggage net can be
fastened to the tie-down rings.
Make sure that all rings are equally loaded when
securing a load.
The tie-down rings are not designed to restrain
loads in serious accidents.
212
Luggage Compartment, Loadspace and Storage
1. Insert the tie-down ring in the opening A of the
mounting rail.
2. Press button C down and slide the tie-down
ring in the corresponding direction.
3. Release button C.
4. Check that the tie-down ring is locked in
position by pushing it.
5. Insert the remaining tie-down rings.
Note on operation
The opposing tie-down rings must always be
inserted in the opposite direction.