It has been a long time ago since I installed Apache, but the thing is that I already installed it on the Pi before installing pi-hole. I remember that installing Apache was just a standard default install.
- sudo apt-get install apache2
I also installed php5 (but only needed if you use php in webpages) - sudo apt-get install php5
Apache uses /var/www/html as default location for your webpages.
Since pi-hole gets installed in the same directory (in sub-directory pihole), there is nothing extra to be done to use the apache server except from starting it: sudo service apache2 starrt
In the webbrowser I request webpage:
'http://xbian/admin/index.php
or you can use the pi ip-address instead of 'xbian' in the URL.