Mix two ounces of fish emulsion with one gallon of water. If you are only fertilizing a few plants, you may want to just use one tablespoon of fish emulsion and one quart of water. Fish emulsion is quite stinky and should be mixed at the time of use instead of left lying around.
Pour the water and fish emulsion mix into a sprayer or mister. Keep the spray light - if the particles are too big they may not be absorbed by the plants.
Spray the mix onto the leaves of the plants, covering them until it runs off. Do this in the early morning or the evening, so that the hot sun does not evaporate the solution.
Repeat for two weeks.