1. Start with clean, dry hair. It's important to start with completely dry hair to avoid damaging your hair with excessive heat.

2. Apply a heat protectant spray or serum to your hair. This will help to protect your hair from heat damage.

3. Section your hair. Divide your hair into sections, using clips or hair ties to keep each section separate. This will make it easier to work with and ensure that you don't miss any areas.

4. Adjust the temperature. Choose a temperature that is appropriate for your hair type. For fine or damaged hair, use a lower temperature, and for thick or coarse hair, use a higher temperature.

5. Clamp the flat iron onto a small section of hair near the roots. Hold the flat iron at a 45° angle and glide it down to the ends of your hair. Repeat this process with each section of hair, working your way around your head. Don't go over the same section of hair more than once. This can cause damage to your hair.

6. Use the flat iron to add curls or waves. You can use the flat iron to create different hairstyles, such as loose waves or tight curls, by twisting the flat iron as you glide it down your hair.

7. Finish with a light hairspray or serum. This will help to hold your style in place and add shine to your hair.