A relaxed hair is usually much easier to control when compared to the unrelaxed hair. But it can be done manageable by straightening it. Using harsh chemical relaxer on your hair can affect the hair, but straight hair can be realized for an unrelaxed hair.
First wash your hair with a shampoo and condition it before starting the styling. Then dry your hair with a towel and brush it fully to get rid of any tangles. Next separate the hair into four equal sections and make a horizontal part that extends from ear to ear. Add a little amount of smoothing cream and secure the section using hair elastic. Make sure to leave the hair for about 1-2 hours to make it completely dry before going further. Now take a straightening comb with a temperature of 250 to 325 degrees and comb through the section one by one. Try to use the comb to separate a small subsection of hair and secure rest of the main section with a scrunchie. Smoothen the small sub section of hair using a boar bristle brush by taking about 1/4 inch from your scalp and slide the flat iron down the sub section. Do this two times and brush the subsection to make it smooth. Repeat this process on the other parts of the hair secure it with hair elastic. After straightening each section of the hair, you can take the scrunchies and style the hair as per your desire.