Problems Installing second server in ispconfig

I have tried to add a second server to an existing and working server, the problems I face is this:

Due to that I do not find a guide describing multi server setup when using nginx i tried to modify the guide slightly and ended up missing to install postfix. both server will have everything installed accept that the second server will not have a ispconfig web-interface.

When installing ISPconfig on the second server I succesfully added it to master server but everything halted when postfix was missing.
I installed required software to my debian server and restarted the install process again but this time everything halted due to that:
" - database already have some fields already"
When going to my ispconfig panel on the master server I can see the the newly added server but I am not sure it was added correctly.

What I need to know is how do I revert the previous setup and start all over without the second server removing the fields added on the master database?

 

how do I remove the tables added by the second server?
What else is needed to be removed before I can add the server again?

 

My problem is that by having the problem before I have not installed anything and by using uninstall.php it just tells me that the file is unknown.
My problem is that I tries to reinstall ispconfig again and when going the expert road I come to the step:

Code:

MySQL master server database name [dbispconfig]:

I get this error code:

Code:

ERROR: Stopped: Database already contains some tables.

and it exits the installation process...
What can I do to correct it?
The master server is a working server with websites already installed and they are live so wiping that one is out of the question..
What exactly do I need to remove on the master database server to complete the installation?
(Or do I have to add something else then bdispconfig in that field?)