Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
It is in the same place in XO. Network tab of the host.
Change the Mode from None to Static (or DHCP). This should get you a pop up to enter the address, netmask, etc.