How do you do the best blowout to your hair?

Im going to a party tonight and before I go I'm going to take a shower. My hair is like naturally wavy/curly and I want it to be straight. I have a straightener, but lately it hasn't been working. I have a Chi and everyone says its the best one. So I don't know whats wrong with my hair. Whats an easy way to blowout your hair to make it look straight with no frizzy looking waves. Also so it's not all poofy. Thanks!!!