This is what i did ---> System tab - Add Server config - and then i have added following values in the tab "Server"
You can not add servers like that. You will have to delete the server entry as it is not connected with any server.
To add a server, install ispconfig on the second server in expert mode and then choose that this server shall join the master server.
Running a multi servers etup is not as easy as running a single server as you have to set correct mysql access permissions to allow the root user of the slave servers to connect to the mysql database of the master server before you install ispconfig, so if this is your first server you might want to start with a single server setup and when you get more comfortable with managing linux servers then extend your setup with more servers.