Mercedes-Benz S-Class Owner's Manual page 164

162 Seats and stowing
Position the pennant staff 2 horizontally on
#
the opening and press it in.
Turn the pennant staff 2 in the opposite
#
direction to the direction of travel until it is in
a vertical position and engages.
Removing
Press the pennant staff 2 into the opening
#
and turn it forwards in the direction of travel
until it is in a horizontal position.
Remove the pennant staff 2.
#
Fit the cover 1 and turn it backwards in the
#
opposite direction to the direction of travel.
The pennant staff can be stowed in the luggage
nets in the boot, for example.