gosh! I've been trying this over and over again... and once I select the color and go to delete it- nothing happens...

I just love this photo of my daughter and just got photoshop CS3. I haven't watched the tutorials yet, but just wondering if anyone knows how to make my daughter's eyes stand out bluer to her real color eyes? thanks! could someone tell me step by step? http://i60.photobucket.com/albums/h...