Do not have admin option

I have downloaded and installed the Virtual Office and have spent two days now trying to get the program to let me change the IP address. It keeps defaulting to the lan address and I want to set it up for internet access.

I don't have the option:

Settings-->System Settings-->ZohoVO Server Host Name

I am logged in as administrator, that is the only thing I have set up. I installed a personal edition. Does that make a difference? I have tried everything imaginable. But nothing seems to work. I know all the ports etc are set right, as I can log on and check my mail remotely using different software and the IP address I am trying to get VO to use. Any help you could give me would be greatly appreciated.