natethegreat,
My wife used to have a 1990 Integra. If memory serves, there's a ring that you have to turn counter-clockwise on the back of the headlamp inside the engine bay. You turn that (it can be a real bugger to get off...how can plastic be so tight?) and then the lamp will come out. Just don't use too much force as everything back there is plastic.
Bogatyr