I've searched through the forums and haven't seen this come up. And that makes me think that it's probably something that is going to seem obvious once I'm clued in.
I used the Panel Editor to create a [very] rudimentary panel. All of that went swimmingly. The wall I'm running into is when I click, "Manage DataFeed". This brings up the "Manage Data Feed Settings" window which, of course, does not yet have a data feed listed. And for the life of me, I can't figure out how to add one.
Now, I did go pretty far down the rabbit hole looking for a solution and trying to understand how this all works. After exporting the example Elite Dangerous Panel and unzipping it, I found the `data_feeds` folder with the `EliteDangerousDataFeed.dll` in it. And finding a DLL made me think that this may not be as simple as filling in a form. I may need to actually build/compile my own dynamic link library.
All of that being said, the fact that there aren't dozens of posts asking how to do this makes me think that I'm just being daft and there's a much simpler solution right in front of my face. But I can't see it.