Remove screws from side of housing.  Lift off the lens retainer ring and the lens.  Then lift out the inside reflective piece that holds the bulb.  Unclip the two wires that hold the bulb in place and pull the bulb out.  Next, pull back the rubber piece that covers the blade terminals and pull apart those apart (you will need to use needle nose pliers).  Replace the bulb, but do not touch the actual bulb.