Delete, deactivate, cancel or remove Yahoo Account: Simple Steps

1. Go to: https://login.yahoo.com/?.done=https%3a%2f%2fedit.yahoo.com%2fconfig%2fdelete_user%3f.scrumb%3d0
           or 
  Sign In using your Yahoo! ID

(https://login.yahoo.com/config/login_verify2?.intl=us&.src=ym)

2. Scroll down to the end page.

3. Put your password into the first box.

4. Inset the code seen in the box.

5. Click "Terminate this Account".


Read More:

http://www.youtube.com/watch?v=J0JTyC9GWEk

http://www.aeinrst.info/delete-yahoo-account-permanently/

http://answers.yahoo.com/question/index?qid=20090429003423AAQB8Mk

http://techinium.com/417/close-yahoo-account-permanently/