Boxbilling

Debian 7
i-mscp 1.2.2
apache 2
php p.4.36

I have installed ioncube and if I do php -v I get the following:

PHP 5.4.36-0+deb7u3 (cli) (built: Jan 9 2015 09:05:14)
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2014 Zend Technologies
with XCache v2.0.0, Copyright (c) 2005-2012, by mOo
with the ionCube PHP Loader v4.7.5, Copyright (c) 2002-2014, by ionCube Ltd.

In which folder should I place the Boxbilling code? I assume that the plugin will look for it in a particular place??
At the moment I have created a client with the same domain name as the panel and have placed it in there but when I run install I get this message:

ionCube loader is required to run BoxBilling. Instructions to install ionCube loaders http://www.ioncube.com/loaders.php or contact support at http://www.boxbilling.com

Any suggestions would be appreciated thanks

Thanks for that.. am busy looking at it right now. I think I might have the install working..

I restarted apache but it seems I should have done this too..

Edit:
Ok I installed it and can get into client area but when I try go to admin area I get this:
Cannot access parent:: when current class scope has no parent in /var/www/virtual/mydomain.com/htdocs/billing/bb-library/Box/Exception.php[17]

Yes I installed the plugin. I installed the boxbilling on a 'client' domain which is the same url as the panel. So it is my domain.
No I did not know about number 3. Will do that now thanks

Edit:
Ok did that but still the same. I came across someone on google who said that xcache caused that error - I am using xcache so will disable and try again

Edit 2:
uninstalled xcache - can now get to admin area - will sort out xcache issue later

Edit 3:
Ok changed owner of Imscp.php and it works - well that part works. Thanks for your help - Sorry I spammed board