How do I change background image?

From: Shannon

Comments

Yes I feel sort of stupid asking this but...I made an interface from Blue Sfear website and the last part is to change the background. But it didn't say how. Here is the url for anyone who wants to see what it looks like: www.bluesfear.com/tutorials/interface.htm I'm obviously not very familiar with Photoshop...so any help is appreciated!!! Thanks!