you can't right now.. cool names (we call them titles by the way) are changing as your post count increases. You'll be a "warrior member" soon, then a "universal soldier", etc.. a few names will come up as you post more..
and then, at 500 posts, you'll be able to change your title to anything you want!
and at 1000 posts, you can even upload an picture of yourself (avatar) which will be on each of your post
Enjoy the site man, welcome to FutureProducers.com!