Old account

Hello, I have or had an account with yahoo ***@***,this is my Facebook login I cannot access this account because I don't remember the password, and I log in to other sites using Facebook and I really need that password, so does that account still exist? Is there a way for me to get another password I really need help, I have a new account with yahoo ***@***, so please don't confuse this one with the old one, thanks very desperate for that old account and password