Question about teacher rec supplement

<p>So I'm not quite sure what is going on with the whole teacher supplement thing (or recommendations, for that matter). I entered my teachers I asked for recommendations online, so does that mean that they are also submitted online?
Also, for the supplement, does that have to printed out and given to them physically so they can mail it, or do they just fill it out online?
Thanks so much for any help in advance!</p>