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When using coconut oil on your hair, choose virgin or unrefined coconut oil. These coconut oils are less processed with no added chemicals, so they contain more nutrients that are beneficial and safer for your hair. High quality coconut oils are pure white when solid and clear when liquid. You can use either a solid or a liquid coconut oil as long as it is high quality. If your coconut oil is in solid form (as most products will be when you purchase them), warm 2 to 8 tablespoons (120 mL) on the stove or in the microwave until the solid has turned into a liquid. Remove the oil from the heat right when it has melted completely–you do not want the oil to get too hot, as you will be applying it to your hair.  The amount you use is entirely based on how much hair you have. If you have short hair that is above your chin, for example, begin with 2 tablespoons (30 mL) of coconut oil. If you have long, thick hair, you may need up to 8 tablespoons (120 mL) to cover your whole head. Before applying the oil to your hair, gently touch the surface of the melted oil with your finger to make sure that it has not gotten too hot. If the oil is uncomfortably hot to the touch, wait a few minutes and test it again. Once the coconut oil has melted, dip your fingers into the oil and gently message it into a section of your hair for about 1 minute. Repeat this until all your hair is covered in the coconut oil.  It might be a good idea to wear clothes that you don’t mind staining with oil, or you can wrap a towel around your shoulders to protect your clothing. You can also apply the oil to your hair by slowly pouring it onto your head. To avoid making a mess, do this either in the shower or pour slowly while holding your head over the sink. To give the oil enough time to strengthen and add shine to your hair, leave it to rest in your hair for at least 30 minutes. You can leave your hair uncovered, or you can protect your clothes and surroundings by putting on a shower cap, or by lightly wrapping your hair in a towel.  If your hair is particularly dry, you can leave the coconut oil in your hair overnight. To do this, cover your hair with a towel or shower cap. You may also want to cover your pillow with a towel so that the oil does not stain your pillowcase. After leaving the coconut oil to condition your hair for at least 30 minutes, wash it out thoroughly with your regular shampoo. If your hair tends to absorb a lot of product, you may need to shampoo more than once to keep your hair from looking oily after. Coconut oil tends to weigh a bit heavily in hair, so you will likely want to skip using a bottled conditioner for at least one wash after the coconut oil wash. For best results, apply coconut oil to your hair every week. If your hair is particularly damaged or dry, you can use a coconut oil conditioning mask up to 3 times per week. If your hair is oily, however, you will likely want to stick to 1 treatment per week.

Summary:
Select a high quality coconut oil. Warm 2 to 8 tablespoons (120 mL) of coconut oil until it's melted. Massage the coconut oil into your hair. Leave the coconut oil in your hair for at least 30 minutes. Rinse out the coconut oil mask. Repeat 1 to 3 times per week.