Finding My Digital Editions on a Mac

Spent most of the last two hours trying to find the book I just purchased from Adobe.  I'm reasonably certain they took my money, and I downloaded Adobe Digital Editions, but I get a message that the ADE file is downloaded but I need to open it in My Account.  I can't find that and I think that explains why I can't find any file called My Digital Editions.

How do I get to My Account?