How do you edit hair?

I really like the hair in the link below, but I would really like to darken the split in the center that goes across the head so that it's more darker and the white hair split line is not as revealing. Does anyone know how this could be edited to do that? Does anyone also know of any similar hairs like this?

https://thesimsresource.com/downloads/details/category/sims4-hair-hairstyles-female/title/haley--female-hairstyle/id/1378624/

https://thesimsresource.com/scaled/2830/w-600h-450-2830485.jpg