How do I delete my account?
To delete your Yahoo account, please read this Yahoo Help article carefully, then use the links under Close your account to go to the account Termination page:
Close your Yahoo account
Sign in and go directly to the Account Termination page here: https://edit.yahoo.com/config/delete_use...
*Note: Your account may take up to 90 days before it is permanently deleted. Do not sign in to your account for 90 days to avoid re-activation.