Server on Linux

is it possible to speak french, easiest for me ...

no, sorry.
English only available on forum, so that anwsers may benefit to most users.

when I put in firefox
http://127.0.0.1/projeqtor/

nothing ...

and if you try http://127.0.0.1/
do you have message "it works"

If you have apache page, then we can concider it works.
But maybe PHP is not completely installed or document root is not default one.

1) check in httpd.conf the DocumentRoot clause.
I expect it to be /var/www, but it may be different. Maybe /var/www/html (it depend on Linux distrib)
The projeqtor directory must be moved into this directory...

2) Create a file named info.php containing :
[code type=php-brief]<?php phpinfo(); ?>[/code]
Put this file in the DocumentRoot folder
Try in your browser http://127.0.01/info.php
It should display PHP configuration.
It it does not work, you PHP setup is not correct.