If you want to know, look for a PRTSCN or "Printscreen" key.
Paste into MS Paint.
If you have a different OS, then I dunno.
Lemme help you out there.
@
Awwwyea
Windows - Use the PrtSc(n) key located at the very top of your keyboard (note, there won't be any effects or anything letting you know that you took the picture), then paste this image into your favorite graphic editing tool (I use GIMP). Save this image and load it up to your favorite image hosting site (I use Dropbox) and post here.
Linux (Ubuntu) - Use the PrtSc(n) key located at the very top of your keyboard, then, when the dialog box shows up, confirm the picture is okay, name it if you want and press the "Save" button. Then, upload this image to your favorite image hosting site (I use Dropbox) and post here.
Mac - Who uses Mac, LOL!
Well now that I posted here, I have to post my desktop...
Don't get too hyped up, I just re-installed Windows and haven't made a good wallpaper yet.