Make 2 braids of your choice. I fishtail my hair for this.
Use something to protect your hair either before or after the braid. I spray this on after.
Using a flat iron, lightly act as if you're straightening the braid. Don't apply too much pressure. Keep doing this for however long you want, the more you do it the waiver.
Straighten the ends a bit as well.
Take out the braids. You're done(: your hair should be wavy depending on the braid(: