Where to change non-USC email?

<p>When I first applied to USC I listed an email on the common app that I currently use rather sparingly, and would very much like to change it to my new email.
I am not talking about <a href="mailto:bob.john@usc.edu">bob.john@usc.edu</a>
I am referring to the initial email I supplied them, aka <a href="mailto:bob@windowslive.com">bob@windowslive.com</a></p>

<p>Where do I go to change this? I've checked the bottom of the emails they have sent me and there are no instructions. Thanks if anybody can help!</p>