If you want to add books to your bookshelf, download an entire book, or add highlights and notes to a book in the Ebook Central database you'll need to access your account.
Once in the Ebook Central database you can access your account by selecting the Sign In link in the top right corner of the page.
From there, follow the directions in the database for downloading or saving ebooks.
If you still have questions you can chat in real-time with a librarian here.