Open your yahoo email account.just type “mail.yahoo.com” in your browser for faster access, and log into your account.
Find the “Help” link, which is in the top right of the screen under the search box.
Choose “Account Configuration” link under the “Using My Yahoo! Mail Account” section of the main Help page.
Click and Read “How to delete” section. You’ll find another page with instruction. Just follow the instruction.
You’ll be asked for your password account. Just enter your password.
If the code was entered, then click YES to terminate the account.
You can see your yahoo e-mail account terminated
IMPORTANT: Deleting your account is a one-way process, be sure you really want to go ahead. Proceed at your own risk!