Click on the dress you want. You can do more than one if you want it to look layered. To remove all dresses, press space. To change the color, press the number the dress is by. Same thing with hair but the up arrow will remove all. The left arrow will change her eye color. There are also three presets you can get if you use the left arrow. Please do not click the space button after the hair page because it messes up the coding.
Thanks EpicEC for helping me debug it. Go over and check their account out.