African hair is different from other types of hair because it's naturally very curly, and it contains no oil of its own. This means you have to add oil to your hair in order to moisturize it properly. If you want your black hair to be soft and flowy, you can achieve this through straightening your hair. You don't have to have your hair professionally relaxed if you don't want to, but in order for your hair to flow it should be straight.
Wash and condition your hair with a moisturizing shampoo and conditioner. Pat your hair dry with a towel when you get out of the shower. Don't rub your hair.
Place one to three drops of oil sheen on your palm and work it into your hair while it's moist. Brush your hair straight while you blow dry it to remove all the moisture.
Use the flat iron to smooth out your hair. Take small sections, about 1 inch across and run the flat iron over them to leave your hair totally straight and flowy.