Hi,
Someone can guide me step by step how it works "DISQUS"? Not that I know I do. If possible, comments in Spanish, Italian or German.

Hello,

the tutorial and full help, you can visit wiki.disqus.net/
You can also take the tour at disqus.com/tour/

In order to use it in your Joomla! site, of course you need to install the plugin and enable it. Then you have to register yourself and your site with disqus.com/