Download the Bluefire Reader app from the App Store (it's free!).
You will immediately be asked for your Adobe ID to sync your device to your Adobe Digital Editions to account. If you don't have an Adobe Digital ID, create one here or through the app.
When authorizing your device, keep the vendor field set to Adobe ID. Once authorization is complete, a pop-up box that reads "This device has been activated" should surface. Press OK.
Now any eBooks you add to Adobe Digital Editions (signed in with your ID) on any platform including PC, Mac, or EBSCO eBook collections can be synced to your device.
If your purchases or downloads haven't synced, close the app and reopen it.
You can also search for eBooks within the app. Press "Get Books." You can search by pressing the magnifying glass in the upper right corner or by browsing the categories. Download the ePub versions of the freely available eBooks.