<p>CMU uses the common app. But what is the supplement, and where can i get it?</p>
<p>I can't get into my S's app right now, but I remember the supplements being available through a link at the top of the screen. That should take you to a page that lists the colleges you've indicated you intend to apply to (make sure you've listed CMU, of course). The supplement link should be next to where CMU is listed on the page. You may have to look close, the link doesn't show up much.</p>