Then you cannot reset the password of the account. The only thing you can do is try to remember what your password was.
You're going to have to set a password for your account to log in. Simply follow the instructions at the top of this page for resetting your password. For email, enter the email address you used on facebook.
You're going to have to set a password for your account to log in. Simply follow the instructions at the top of this page for resetting your password. For email, enter your Yahoo/Gmail email address that was connected to your account.