E-book access (e.g. number of simultaneous users, print and copy amounts) vary according to publisher / type of activity. You can read e-books online, or borrow e-books from most of the e-book services, and download them to your own device. The downloaded book can be read without internet connection.
To download e-books you need to install a reader application on your own device. For some services you also need to create their own user ID.
If you need further help with reading e-books you can contact Library's customer service or book a librarian for personal one hour guidance on using and downloading e-books.