It works.

Now my forum with his beautiful portal is nested in a folder.
Thanks to this simple metatag html, I can redirect from the root of my website:

thank you!
I use Notpad++; also I have a backup copy of the original .htaccess.

Now I'm going for another way. I want to reinstall my phpbb with his portal in a dedicated folder (something like "forum"). Then I'd like to redirect, from the index in the root of my site , to forum/portal.php.

Do you ...

Your Portal Version: 1.0.4
Your phpBB Type: Standard phpBB3
MODs installed: No
Your knowledge: Beginner
Boardlink: http://www.forumcittanuova.it/

What have you done before the problem was there?
installed phpBB 3.0.6.
installed Board3portal 1.0.4.

What have you already tryed to solve ...