Submitted by Massimiliano on 16/08/2011
By default Drupal 7 does not enable the email field and homepage field in comment form for anonymous posts: so, enable them is very simple.
In your admin area, go to:
Structure -> Content types -> Article ( choose the content type you want, in my case Article and click on edit ) -> Comment settings -> Anonymous commenting (choose one of: Anonymous posters may/must leave their contact information) -> Save content type
