Can't Enable Version Control

Hi,

I have a website that needs to be edited from 3 different locations (UK, US and Romania) and we are trying to set up Version control. i have installed on my server Apache and CobaltNet Subversion Edge, we have opened port 3690 to conect to the server, now.. we can't connect to the server using an SVN connection but we can connect using an HTTP connection but when we try to edit the web page we get the following message:

This is the how we have set up our version control:

Any help will be highly appreciated as we need to deply Contribute in the next 10 days.

Thank you!