hold down alt+print Screen(its in top right of keyboard, name may be a little different) then open paint. Then do Edit->Paste and save it. Upload to imageshack or photobucket and copy and paste url into your post.
Print screen. (Button on the top right of your keyboard, I guess) Open paint. Click edit and then paste it. Upload it on Photobucket or imageshack, doesn't matter. Get your link, post the image here.