> This game needs a detailed tutorial for each version.
Not really, very few tiny details changed since the recording of tutorial videos and current version, everything works more or less like shown in the videos.
> When I try to chat, I get an error message.
I am pretty sure the error message tells you what you are doing wrong, I made them for a reason
> Creating an AI profile and saving it doesn't do anything
exactly because it is only used when you engage in AI chat, otherwise it serves no purpose, so nothing should happen when you create it, it's just text stored in memory
> clicking ADD NPC just closes the window and nothing happens.
it should close UI window and add a NPC character near the location of your camera
I am sorry, but I can't really help you much, I understand UI is not very clear and simple sometimes, and that game can be buggy. But I am sure if you give it some time and play around you fill figure out how things work.