open Paint and collpase it so you see the desktop
press CTRL-Print Screen
paste (CTRL-V) in Paint
save image to your computer
go to http://www.imageshack.us/
select the image you saved
press "Host it!"
middle of the page, look for "Hotlink for forums (1)"
uncheck "Include details"
copy (CTRL-C) the URL inside the box to the left of "Hotlink for forums (1)"
paste that URL here...