Map any blog/site on a WordPressMU or WordPress 3.X network to an external domain.
By default, WordPress now installs to a single "wp" directory. This can be overridden during the install. But, for my install, I did not.
This plugin is written, expecting the three separate "wp-..." directories at the root and not within a single "wp" directory. It presents a message to that fact and will not work with it. At least it checks.
My hosting uses cPanel. I am following the cPanel instructions. I create a "parked domain" for my subdomain site which, not surprisingly, acts like a parked domain, and does not work with WP Multi-site at all.
All the documentation for this is bewildering, terribly written, and the "tutorial" is totally out-of-date.
I'm sure the only answer I'll get is "Contact your host support"...