Adding an alternate mail on Yahoo account requires a few steps:
• Initially, log in to the Yahoo Account Information page by entering your Yahoo Mail account user ID & password.
• Then after entering the “Sign-In and Security” link, enter the “Update Password Reset Information.”
• Next, you need to click the “Add Another” choice in the Email Addresses category. And type the new email address.
• Hit the “Save” button and enter “Done.”