CITROËN C3 PICASSO 2012 Owner's Handbook Manual page 160

Practical information
Taking out the wheel
Unscrew the yellow central bolt, and
remove it.
Raise the spare wheel towards you from
the rear.
Take the wheel out of the boot.
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Putting the wheel back in place
Put the wheel back in its housing.
Refit the yellow central bolt in the centre of
the wheel.
Tighten fully until the central bolt clicks to
retain the wheel correctly.
Put the polystyrene storage box back in
place.
Put the box back in place and clip it.