If you are already a user of a yahoo email account and you wondering how to access your account and how to recover forgot yahoo email password, all you need is your phone no or alternate email, then go to the login page of yahoo email, enter your email address or username, then click the “forgot password” key, then on the next screen you will see the option “mobile no or alternate email”, enter your email address, then you will be required to enter the verification code sent on your alternate email address, enter the code and set your new password.

See here - https://sites.google.com/view/yahoopasswoordrecoverynumber/