Just fiddling with a schematic - don’t worry about nothing being connected to the Pro Mini at this stage. I run a rules check and get
What is that ruling telling me, and how do I fix it?
Hello Rick, that’s a poorly worded message telling you that there is at least one “power input” pin on a net but no “power output” pin driving it. You have two choices, you can add another power flag to pin U1-2 or you can change it’s electrical type to “power output”. Did you create that symbol or is it from the KiCad library?
PS. Hope you’re not downwind of all that smoke. 
The symbol U1 is from the KiCAD library. I managed to get the pin 2 adjusted to Power Output even though KiCAD told me it wouldn’t change it. Perhaps it changed it in the drawing but couldn’t in the library because I don’t have ‘write’ privileges there.
U1 is an AP1117 3.3V regulator so I assume pin 3 would be Power Input and Pin 1 would be Passive. Is that right?
Yes, pin 3 is a power input and pin 1 can be left as passive or it could be a power input. I don’t know why the KiCad library has the output of a voltage regulator set to passive is almost always requires changing or the needless addition of a power flag.
If you modify a symbol from the KiCad library then you should probably save it to a library of your own. That way any updates to the library don’t overwrite your changes.
I would guess it is an oversight
With a comment like that, one would think that the library maintainers are only human, not the omniscient super beings that we… well… ok… Yeah, I guess they are human after all. 
BTW, keep up the good work on the libraries, Rene and all the others.
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