To post your desktop...
1.) Have your desktop showing on your comp, then press "Print Screen/SysRq". Its a button on your keyboard.
2.) Go into paint, or any other graphics program and just paste it. Then save it as a .jpeg/.jpg image.
3.) Next, you have to put your image online. Host it on some free webspace. If you dont have your own webspace, you can always e-mail the image to someone who does, and they can put it online for you.
Or if you want to have it easy, just tell us about it!