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Use lightweight styling mousse on dry, clean, straightened hair. It would be a good idea to straighten your hair, even if it is naturally curly. This will help prevent frizz. Make sure your hair has been recently washed. A straightener can fry dirty hair. Consider pulling your hair up into a loose bun with the bottom half loose. This will give you a more manageable amount of hair to work with, while keeping the extra hair out of the way. The smaller sections you work with, the more crimped your hair will be. Flip the straightener upwards by 180°. Gently tug downward on the loose ends of the hair section. This will create a curve. Flip the straightener downwards by 180°. Meanwhile, gently tug on the loose ends of the hair section upwards. This will complete the crimp. If you touch it too soon, you may mess up the crimps before they set. This will help set the crimps and make them last longer.

Summary:
Apply styling mouse. Pull part of your hair into a loose bun. Take a small section of hair. Rotate the straightener upwards while holding the hair section down. Rotate the straightener downwards while holding the hair section up. Let your hair cool before you touch it. Consider spraying your hair with some hairspray.