This has to be one of the few places I haven't seen this. It's pretty simple. Just screenshot your desktop and upload. =P
For those who don't have a screenshot program, simplest way is to make sure you have what you want on your screen, hit the
Print Scr button, go to your Start menu->All Programs->Accessories->Paint->Ctrl+V. Then save it as whatever title and whatever format you'd like .jpeg, .bmp whatever, go to an image hosting site such as ImageShack and upload.
Here's mine.
Remember. Thumbnail. Click for full view.