How to change the passenger side headlight bulb? I don't have a manual. Thanks.

 

Get a manual. The 91 manual will work for you.

East Coast Honda Manuals Download

good luck

 

ideally, when changing a light bulb, it's better to have more room to do anything.
so remove your battry, hope you know how to do that already.

unplug the light bulb harness.
and turn the head light bulb by it's base and turn it left. [lefty loosy righty tighty]
and don't touch the bulb btw, it's crucial for life of the bulb. any oil on the bulb surface will reduce the bulb's life.
put the new bulb in, connect the harness back, and you should be done.