Well, when I was younger, I remember girls in school actually ironing their hair on an iron board with a real iron, but if you do that, take precaution to protect your face from any iron burns or wet your hair slightly to avoid drying out the ends, it s an old fashioned way but it worked if you want to hassle with it all.......Good Luck!
The only way you can do that is to chemically straighten it, which requires going to the salon, but it lasts for about a month. A guy I know does this, but beware because it damages the hair.