How to remove your Yahoo account
Direct link to delete your account, and of course, all associated Yahoo services cannot be used anymore. So also Flickr (if you have it) will be removed by this action! If you wish to delete only your Flickr account, find Flickr in our list: you can delete that one separately.
Direct removal link: https://edit.yahoo.com/config/delete_user
Helpful Trick: Removing online data
Publicly visible text/images often aren’t properly removed even when you succeed in removing an account. Try editing or removing them manually before removing the account itself. If you’re unsure what happens to your tracks: this can be found mostly in the Terms of Service/Privacy Policy; otherwise you can always contact Yahoo and ask personally. By the way, removal requests don’t necessarily mean your data will actually be removed (e.g. due to legal obligations).