Hi and Welcome. My Name is ***** ***** I look forward to assisting you today with your question.
Amazon ID is your email address. To find out what the ID is, you can try to create an Amazon ID again with your existing emails and if you get that email is already taken, then that would be your registered ID. You can try creating the ID from here ---> https://goo.gl/JJkVEW
If you don't remember the password ***** the ID, then you can reset the password ***** here --> https://www.amazon.com/gp/css/account/forgot-password/email.html
Let me know the results please.