To recover your Yahoo account, you have to reset the password to your account. You need to have
access to your Mobile Phone or Alternate Email ID for the recovery process.
Go to the Yahoo Sign-in Helper page and click on the forgot password link. Then you need to click on the mobile phone verification option, you’ll receive a code on your mobile phone. Enter that code to the correct box and click on the submit button. After that, you can enter the new password and confirm it. After that you’ll be able access your Yahoo without any worries.