Get the App
You will need to download one of two apps: Overdrive or Libby. Overdrive is the original; Libby is newer but the interface is simplistic. Choose the one that feels right to you!
Find your Library
Once you have the app, you will need to search for your library. You will be taken to the homepage of the Green Mountain Library Consortium. Sign in with your library card number.
(Oh yeah, you will need your library card.)
Start checking out books!