Yahoo login Problem

Hi i have problem that i have not login in yahoo account when i made facebook account i have never ever open yahoo account since 6 or 7 years now the problem is this that my facebook account password has been changed by some one and when i login in facebook its says that you have entre an old password i want to confirm through yahoo mail but its saya we dont reconize you email now plzz tell me what to do now plz help me plz