After you've signed up via https://driving-tests.org/library/, we send you a link to your library driver's ed program. You place that link on your library website and let your users know.
To use the program, they visit the link.
There is no authentication of any kind: your users don't need to enter their library card number or create an account. We do not collect any personal information, and we do not display ads. The program is free for your library and your users. It's an effective, interesting way to study for the written DMV test.