IIRC
You have to go to the settings tab, THEN hit the 'Advanced' button, THEN it's somewhere in there.
Requires a reboot, too. :P
"Here at Ortillery Command we have at our disposal hundred megawatt laser beams, mach 20 titanium rods and guided thermonuclear bombs. Some people say we think that we're God. We're not God. We just borrowed his 'SMITE' button for our fire control system."