Using a different account on Adobe Digital Editions

How do I start to use a new account in Adobe Digital Editions 4.5 ?

I have an old account hooked up to an e-mail address that is no longer used or accessible. I do not remember the password and can not have a reminder sent to me because the address is no longer accessible. So I started a new account through Adobe Chat Line. I can not figure out how to use the new account e-mail address. Someone help p[lease.