This is quite frustrating.
I did find that I needed to make the change in the database.
This is a REAL newb question, but do I have to install DNN on the IIS server? I mean, I installed it to my Visual Studio, then created a new DNN project, then published that entire project to my IIS directory. Is that sufficient, or do I have to do something else? I'm sure this is a dumb question, but I've been staring at this for 24 hours now, and I'm afraid that my years of ISP experience is making me presume/assume things that I should not presume/assume.