Honda 2000 Civic Owner's Manual page 222

Lights
8. Reset the fastener by pushing on
the pointed end until it pops back
almost flush with the fingers on
the housing.
Maintenance
9. Put the fastener in the hole on the
side of the trunk lining and push
on the center until it locks (the
center is flush with the head).
Replacing Rear Bulbs (in Trunk
Lid)
1. Open the trunk.
2. Determine which of the two bulbs
is burned out: taillight or back-up
light.
3. Remove the socket by turning it
one-quarter turn counterclockwise.