Photoshop Hue/Saturation modifying image colors

I have had a few friends ask me how to change the shirt color or a persons eyes in pictures using Photoshop. This is something I do all the time! If I find a image on stock.xchng (free stock photo site) and I don't like the shirt color someone is wearing I simply modify it in Photoshop to my liking.
Today I am going to use an example of a Tree frog to adjust its hue and saturation. The reason I wanted to use a tree frog is because it has very bright vibrant colors but you can use this tutorial on any image!
The first thing we are going to do is create a new Photoshop file by going to File-->new and select your size and background color. For my image I am using a white background 510 wide by 373 high. Now that we have a blank Photoshop file lets create a new layer. Open up your layers panel (F7 or go to Window-->Layers) and create a new layer. I called my layer Tree Frog. Now paste in your image that you wish to change.









