Finally I did it by self
– Go to cpanel of the site
– Choose “Software/Services” Section
– Click on “Fantastico de Luxo” button

On the left side menu you can see all kind of software you can install only by one click.
There are WordPress, Drupal, Joomla, PHP-Nuke and much more options in the menu.

Choose what you need and start auto-installation.
Before that you need to delete index.php file from the root directory.

That’s all:-)

P.S. Before you are buying the hosting you should check if they have this fantastic tool (Fantastico de Luxo) in their services.
I’m using in this case www47.a2hosting.com hosting