There are two ways to change the from field (and from email address, if that needs changing as well) in your email campaigns. The first is to hover over the tools icon at the top-right, and select Settings & Billing. There, click the Sender Info tab, and update your RSVP name.
The second way, if you want to change the field for just one mailing, is to edit it after clicking Review & Send in your campaign. You'll be taken to a page where you can highlight "gradandadult" and type "School of Graduate and Adult Education."