Kryo,
I was successfull!!. My problem was that I was typing in the command line given in the instructions into my target box.
"C:\Program Files\Stardock\TotalGaming\GalCiv2\Twilight\GC2TwilightOfTheArnor.exe" cheat
This is the target line my game points to
"C:\Program Files\Stardock Games\Galactic Civilizations II - Ultimate Edition\Twilight\GC2TwilightOfTheArnor.exe" cheat
All I had to do was simply add the word "cheat" at the end of this string. When I did, I was then able to use the cheat commands! Ctrl + P doesn't seem to work for the planet selected. Instead what happens, is when I hit Shift + Ctrl + P, ALL uninhabited planets become habitable...even those of the other races. Is this supposed to happen or can I somehow make it work on only the selected planet? All the other commands work though.