The socket and bulb are removed from the back of the assemblies. The bulb are held in their socket in a number of ways. Some bulds are simply pushed into and pulled out of their sockets, and some are screwd in and out. To releasw BAYONNET STYLE bulb from its socket. The buld off the mounting tab then turning the bulb and removing it from the retaining pin. To replace a bulb accordingly from its socket and insert a new bulb.