You have access to a wide variety of e-books through the library. As the distribution of e-books is maintained by different platforms, how one gains access varies accordingly.
Adobe Digital Editions Windows/Mac | Google Play | App store
Bluefire Reader Google Play | App store
Create an Adobe-ID
Linux users can use Adobe Digital Editions with Wine.
You can make all sorts of annotations in Adobe Digital Editions: notes, bookmarks and highlights.
Your annotations disappear when the book's loan period expires – until you borrow the book again. The annotations don't, however, reappear automatically. How to retreive your annotations: