CITROEN DS4 Owner's Handbook Manual page 155

Storage drawers
Located under each front seat, except for the driver's seat on versions with electric seat.
Opening
 Raise the front of the drawer and pull it open.
Do not place heavy objects in the
drawer.
Removal
Avoid removing the drawer completely, as
refitting it is not easy.
 Open the drawer fully.
 Pull the drawer upwards to disengage it.
Refitting
However, if it has been completely removed, to
refit it:
 use the torch to illuminate the area under
the seat,
 engage the drawer in its runners,
 lift the retaining tongues and slide the
drawer under these tongues,
 at the end of its travel, press down on the
drawer to engage it.
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Fittings