How to replace rear light bulb on 1998 Honda Civic?

The rear drum brakes are self adjusting. This happens each time you back up and apply the brakes. You can speed the process by backing up and using the hand brake to stop. If for some reason this is not working you can, on some cars manually adjust the brakes by removing a small rubber seal on the lower part of the backing plate at each wheel. You then use a brake adjustment wrench to rotate a star wheel and tighten the brake shoes snugly against the drum until it cannot be turned by hand. Back it off until the wheel can be turned freely. I would first try removing the wheel and drum and clean all components with a spray brake assembly cleaner. More than likely, it is not working due to corrosion or dirt in and around the assembly.