Install the Bluefire Reader app or Aldiko Book Readerapp on your Android device, Ipad, or Kindle Fire (only need to do this once).
Create an Adobe ID if you do not already have one, and register your Adobe ID in Bluefire Reader or Aldiko Book Reader.
Using your Android device, Ipad, or Kindle Fire, download an ebook and read it using the Bluefire Reader or Aldiko Book Reader. You will have access to the book for the number of days allowed for each checkout.
For e-books from EBL, Ebrary, and EBSCO
Download Adobe Digital Editions on your computer and create an Adobe ID if necessary.
Download the e-book on your computer and open the file in Adobe Digital Editions.
Connect your Nook to the computer through its USB cable. You should see the Nook appear in Adobe Digital Editions (on the left side, in the listing of bookshelves, underneath all items/borrowed/purchased/recently read).
With your mouse, drag the book to the Nook. It will be copied onto your Nook immediately. You will have access to the book on your Nook for the number of days allowed for each checkout.