There are four types of E-books you can access from the Online Public Access Catalog. Each provider can be accessed directly from their respective websites. Sections are linked to the appropriate site. Also, links are provided on the Library Catalog Page. Overdrive and Infobase will need passwords. Project Gutenberg does not need a password and Alabama Virtual Library Books will need site authentication in the State of Alabama (if you have trouble open this link, then click on the OPAC link to view ebook).
Instructions to use Gutenberg with your Device.