How to delete Yahoo account?

Here is how you can do this-
a) Point your web browser to https://edit.yahoo.com/config/delete_user
b) Login using your ID and password.
c) You need to enter the password again to confirm.
d) You need to enter the code displayed as well.
e) Click on the “Terminate this Account” button.

Once you do this your account will be gone. For more information on this please visit
http://help.yahoo.com/l/us/yahoo/edit/changing_users/edit-23.html

All the best!