The question was not "how do I install CentOS?" or "How do I set up the network" that I have all figured out.
I was simply curious if there was a way to go Back to the setup step with that. Looks like there isn't.
Then I decided that if I'm going to bother starting over the install I'd down the minimal ISO rather than the netinstall ISO.
Ans then I didn't deal with IP configuration until the machine was installed and running because it was easier anyway.
Where in that is a stupid question - nowhere. Maybe it could have been clearer, but I honestly don't think I'm really incompetent anymore. I'm confident that I can resolve most if not all things that need to be taken care of on nodes and customers' VPSes and if not I know who to ask or pay for assistance to get it resolved as quickly if I had done it myself.
That said, I was able to set up a KVM node today (in fact, this server in question) on the first try and it is working great. Just need to wait for RAID to sync because it's quite slow right now LOL. If it's still slow, I'll buy the upgrade to four drives instead of two or fine some other solution.