Desktop
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1. Make your desktop how you want it to appear in the picture, and press the [Print Screen] key, located in the upper-right corner of the keyboard above the arrow keys. This will copy the contents of the screen to your Clipboard, a hidden place in memory that stores any information that has been recently copied. (PrtSc may be in a different position depending on if you are using a laptop or desktop.)
2. Open up any image editing program (such as Microsoft Paint or Adobe Photoshop), and paste the image by using the Paste shortcut (hold the [Ctrl] button, and press [V]) or by choosing the Paste option under the Edit menu.
3. Edit your image as necessary, and save it when you are finished.
4. Host on any imagehosting site. Tinypic, Photobucket, or Imageshack
5. Copy the IMG CODE and paste.