What template are you use? Try to switch to default Joomla's template and check if it will work with it. BTW you're using outdated version of Joomla - this is couldn't be problem's source but I suggest you to update to the latest stable version of Joomla (for performance and security reasons).
Hi!
Thanks for your answer.
I'm using the template SoccerNew, and you're right, the problem is the template because I've tried to use "JA purity" and I'm able to comment the articles!
Have you got a solution for the template? Could I fix something?
Thank you.