Problem using Contenido CMS

[PixXel]

Hi,

i have problems to use my CMS (Contenido: http://www.contenido.org/en/index-d-205-4.html)

I will install the Backend for all Customers on cms.mydomain.de.
The Frontends should reside at their own httpdocs.

The folders after install on cms.mydomain.de:

D:\Inetpub\vhosts\cms.mydomain.de\httpdocs\cms <- Fontend 1. Customer
D:\Inetpub\vhosts\cms.mydomain.de\httpdocs\conlib
D:\Inetpub\vhosts\cms.mydomain.de\httpdocs\contenido <- Backend
D:\Inetpub\vhosts\cms.mydomain.de\httpdocs\docs
D:\Inetpub\vhosts\cms.mydomain.de\httpdocs\pear
D:\Inetpub\vhosts\cms.mydomain.de\httpdocs\setup <- delete after setup

If i create a new customer (example cms2), the frontend will be created in
D:\Inetpub\vhosts\cms.mydomain.de\httpdocs\cms2

But I want to create the frontend in the customers httpdocs
D:\Inetpub\vhosts\cms2.de\httpdocs

In Contenido I can easy edit the Pathes, but how to change the permissions for edit files over the Backend?
Does anyone knows how to get this working?