When searching in the library catalog, use the "Limit Search Results" options to see only materials in a particular format:
(The number in parentheses next to each option tells you how search results are in that format.)
The catalog records you find will contain a direct link to the e-book or streaming video – look for the "Electronic Access" link. If you're off-campus, you'll be prompted to log in with your MyAACC credentials or library card number.