Gaining access to /etc/sentora folder

[grower88]

I am trying to set up xbilling. The xbilling module loaded OK but I need the Front-end Config Script.
I have read that I need to change "zpanel" to "sentora" in the controller.ext.php file.
I cannot access this file due to permissions on sentora/panel/modules/xbilling/code.......folders.
Does anyone know how to gain access to edit controller.ext.php as I'm unable to change file permissions to access this file.
ubuntu 14 on AWS instance

[Me.B]

use SSH & raise your permission with sudo to get root privileges.

M B