For those who want to but don't know how, also good to know for uploading any image onto the forum:
Screen shot your wallpaper-The button is to the right of F12.
Then go to paint and press (at the same time Ctrl and V) Ctrl is bottom left
Then save the file
Then go to www.tinypic.com
Click the "Browse" button.
Select the file you saved, click OK.
Then Click 'Upload Now'
Then Copy the code below 'IMG Code for Forums & Message Boards'
Then go to the forum and press Ctrl V (or Select Edit-Paste
Then submit your post.