multiple email and password

I have a samsung tablet 3 with ereader.

Because  there put new software on my tablet because of other problems I have to login by AdobeID.

I did not remember my email en password. So I make a new one (2 times with 2 emails)

Because I have to log in with the email en password that I used at the first time I can't read now on mij tablet reader.....