I suppose that the existence of this thread, and the need for directions as specific, granular, and illustrated as those I was provided should tell you everything you need to know.
Opening the BTT config window again, there is nothing on that screen that shows me what the default configuration is, no prompts or controls that would clearly create a new button or command for the touch bar, no pre-made buttons or commands that I could copy and play around with, so on and so forth. I quite literally only have 2 empty boxes, one striped and one solid, and nothing else to go on.
I didn't have time when I made the thread to search for a tutorial online; I only had this forum. And even here, there's no "How to create a button" thread presented to first time users.
I would recommend a popup that is shown on the user's first login that links to a welcome message on the forum [that does not require registration to view], and possibly plays a tutorial video if the user wants to watch one. Don't bury it in context menus or the header bar. Alos, create a pre-loaded example set of controls that open Safari and take the user to the forums, or something else innocuous, so that the user can click that and see what a functional control looks like from the first minute.
Hope that perspective helps. Had it not been for Cali above, I would have requested a refund for my license by now.