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Separate your hair into three to four sections. Heat your iron to the lowest functional setting. Un-tie and brush out one section. Run the flat iron and a comb through that section. Repeat with the other sections. Set your look with hairspray (optional).
Use either your fingers or a comb to separate your hair. Secure the separate sections using hair ties or hair clips. The less heat you use on natural hair, the better. Switch your flat iron to the lowest setting that will still straighten your hair in 1-2 passes and wait for it to warm up. This may take some trial and error, as different hair textures will respond better to different temperatures. There should be a light, or something similar, on your flat iron that goes on or off to indicate it's ready for use. It should say somewhere in your instructions how to tell when you're flat iron's ready to use. Remove one of your sections from the hair tie. Either run your fingers through your hair to comb it out or quickly run a brush through it. Clamp the flat iron around the section near the roots, placing the full section with the flat iron. Place a fine-toothed comb just below the flat iron. Slowly move both the flat iron and the comb from your roots to your tips. This should gradually straighten your hair. Go slowly, as this will help your hair flatten on the first stroke. You generally want to avoid running the flat iron over the hair too much. This can damage your hair. Depending upon your hair's texture, you may need to make 2 passes, but be sure to use a heat protectant and keep the number of passes to a minimum. Repeat this process with every other section to complete the look. Remove the section from the hair tie or hair clips. Run the flat iron from root to tip, running a brush through your hair just below the flat iron. If you want, you can spritz on a light layer of hairspray to set the look. You can also tease your hair with your fingers or a brush first to get it fall the way you want.