How do you change the interior light of a Nissan march K12?

Stick a flat screwdriver underneat the plastic sides of the dome light housing and pry the whole housing from the ceilng. Disconnect the cable. You'll find two little screws which are holding down a little metal plate which is actualy located above the lightbulb and acts as a reflector for the light. Uncrew these little screws and remove the metal plate. The lightbulb is now exposed and can be replaced. Work in reverse to get everything in the right place again after you have changed the lightbulb.