I have had a Kobo eReader for many years. Recently I tried using ADE for a library book and could not remember my ADE ID as it had been many years. I created a new one but now books I purchased with the previous ID are no longer transferring from ADE to my device. How can I find out the previous account? Can I merge the two? If I can't find the previous account can I change the account that the books are associated with?