Dear gianfranco,
If you want to have comments just in some article and not in all of them:
Kindly setup and publish plugin JACOMMENT ON to do this:
When you edit or add new an article you could click on button JA Comment On in bottom of editor or use code {jacomment on} insert into an article to enable comment for this article. The comment will be showed without selecting category or menu in plugin content JAComment.
Conversely, If you want to insert an article without the possibility to be commented
You could use plugin JACOMMENT OFF. You could click on button JA Comment Off in bottom of your editor or use code {jacomment off} insert into an article to disable comment for this.
Best Regards.
