I just purchased (today) an Apple MacBook. Earlier, I was able to change the desktop background. After staring at the new wallpaper, I've decided that I would like to change it. However, when I do the <Desktop> <Change Desktop Background> thing that I did earlier, it doesn't work. I tried to do the System Preferences --> Desktop/Screensaver, but that didn't take me anywhere (the screen stayed empty).
HELP!
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