Before I realized that it was BD causing all my printer problems I had down loaded new drivers and spent a whole day trying to get the printer to work.
I finally got the settings right completely by accident and then today the problem was back and I could not see an obvious problem in the firewall so I went back to reinstalling the printer drivers and wasting hours of my time because it wasn’t seeing the printer. 
I went back to the Firewall and again played with the settings and adding IP addresses that were visible but I have no idea of what they went to. I finally got it to work after experimenting with the settings turning things off & on, but I have no idea what I did to fix it. Plus I don’t know if I allowed an IP that I shouldn’t have. 
I have two questions”
Why is the fire wall always changing my settings and how do I stop it?
Also where can I find a comprehensive description of each setting so that I’m not just guessing?