Logging Issue on my iPhone

Hello, My name is Austin Beller and I am trying to log back into my IMDBPro account. I keep getting into a situation today where when it says to use my IMDB account under my Gmail account that it says another account is the correct one and to use that one. I am not sure how to get past this. I did recently cancel my Amazon account under one email and made a new account using a different email. What I really just need to know is what is the username and password that is still registered with my IMDB account? The one I just thought was right was not correct.