How to revert from Authorization Without an ID to Authorize Adobe ID or Vendor ID?

When I downloaded Adobe Digital Edition, I was given the option to Authorize my purchase with and ID or Without it. I obviously, had no idea what that meant so I went ahead and selected without ID authorization. Turns out I am not able to share my book on any other device, wich of course I found out much later on after hours of figuring why I couldn't install the book on my tablet. Please help!!!! how do I revert this? Many thanks