This week EBL and ebrary merged into Proquest Ebook Central. Links on the Research Gateway for both now go to the new site. https://login.ezproxy.usd.edu/login?url=http://ebookcentral.proquest.com/lib/usd
To assist with the change, ProQuest has video tutorials that cover using bookshelves, searching for books, and downloading content.
Ebook Central LibGuide is chock-full of screen grabs and how-tos for all the important end-user features.