Unfortunately, the provided reference material offers limited specific instructions on how to curl curly hair with a flat iron. The excerpt describes straightening hair with a flat iron, not creating curls. Therefore, it's impossible to give a complete and accurate answer based solely on the provided text.
To curl hair (of any type, including curly hair) with a flat iron, the general technique involves clamping the flat iron near the root, rotating the iron 180-360 degrees, and then gliding it down the hair shaft. However, adapting this technique for already curly hair requires careful consideration to avoid frizz or unwanted straightening of the existing curl pattern. Further research and resources would be needed to provide detailed instructions for this specific task.
