I followed a tutorial from "dungeon quilter" I found on this message board. If you go to the "search" page you will be able to find it.
Thank you all for your lovely comments, I was not expecting such a response. When I said it is not perfect, it is because I am not happy about the very center of the dahlia. I realize now that the most important folds are the first ones. They have to be exactly the same so that the center is a perfect star, the rest of the folds fall into shape easily. Again, thank you all for your comments .