前 refers to the "front" of tangible objects (eg, a car) or the "forward" direction, but when it refer to time, 前 means "～ ago" or "previous(ly)".
10年前 ten years ago
前に聞いた話 a story I heard a while back
前の記事 previous article
もっと前の出来事 an event that happened even before it
So when I see a button saying 前 on a tutorial site like TextFugu, I would ...