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Web Hosting and Cloud Computing Control Panels
Personally, I first add the IP address to the server first (which causes the IP to load on bootup), and then I setup the Virtual Server to use it.
In your case, I'd be curious if what you said might work -- adding it to the "Virtual IP with ___" line, and see if that causes .it to bring up a new interface with that IP.
If not, you'll simply need to add a new interface first. You can do that in Webmin -> Networking -> Network Interfaces, and add a new interface in there.
-Eric