Probem via upload ftp

You need to make sure that you have uploaded your files to the correct folder.

Also, if in the same folder there are some default files like index.php, you should delete them.

I search on the documentations of the VPS server about the right folder to upload the files and I am uploading on /var/www/html, but still the same problem.
I also search for the index.php and I don't found it.

https://askubuntu.com/questions/413310/where-to-find-default-test-page-for-apache2

... for inspiration purposes only ...

This test page is coming from somewhere, you need to find it, delete and upload your application to that folder.

Really hard to understand what does it have to do with PHPRunner though.

For your site to run smoothly just put your html and css files inside a directory in /var/www name it mysite for example.
Then you can run your default(index.html) file of your site just by locating to /var/www/mysite
unquote excerpt out of URL above

Now in my wording: You need to UPLOAD a URL re-direct coded index.html which points to the /var/www/yoursite
root directory uploaded index.php (already done by PHPRunner as you said) into the /var/www directory.
Nota bene: Apache2 looks into /var/www for an index.html first, if found, it is displaying same (currently this is the standard
page shipped by default you are seeing right now, hence you need to alter that very one as explained above) and once the
modified index.html is correctly pointing to the index.php file in your YOURSITE subdirectory, it should work, I think.

.... above HTML code sample needs to get altered and inserted on top into the /var/www/index.html ..., for inspiration purposes only,