How to delete a yahoo id or account?
To delete one of your profiles, go to My Profiles and click the “Delete” link to the right of the appropriate profile name. It is not possible to delete the profile associated with your main Yahoo! ID on the My Profiles page. Profiles for your main Yahoo! ID or your Yahoo! Mail account can only be deleted by closing your account and removing all of the information they contain. If you don’t want any information displayed on the profile for your Yahoo! ID or Mail account, simply remove all of the content in the profile. Please refer the guidelines under link – http://help.yahoo.