Anoka County Library created the following slideshow presentations for downloading e-books to various devices. The steps in downloading e-books should apply to any library that uses Overdrive.
Downloading to the Kindle
Downloading to other eReaders and smartphones
The slideshows also show how to request e-books and return them early.
I found the slideshows to be extremely helpful, particularly the screenshots showing each step in the process, being the visual learner I am.