If you ask Yahoo! to delete your Yahoo! account, in most cases your account will be deactivated and then deleted from our user registration database in approximately 90 days. This delay is necessary to discourage users from engaging in fraudulent activity
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To have your Yahoo! ID and/or Yahoo! Mail account deleted, please submit
[ https://edit.yahoo.com/config/delete_user ]
If you ask Yahoo! to delete your Yahoo! account, in most cases your account will be deactivated and then deleted from our user registration database in approximately 90 days. This delay is necessary to discourage users from engaging in fraudulent activity
Go to your address book, highlight the address, hit delete.
In your yahoo page where you go to write letters, there is a tab for addresses. There is where you right click and delete..