How to create tutorial for NDA platforms?

I want to share my knowledge about setting up things on NDA platforms but according to the NDA, I can’t make it public. We have a special private forum here for these platforms and, on the other hand, we can create a Community Tutorials. However, I can’t figure out how to make my tutorial visible on the private forum only. I can’t select the private-forum category while creating new Community Tutorial so I’m guessing it will be visible publicly.

So is there a way to share knowledge for NDA platforms other than creating post on the private forum?