Unable to get into Galaxy Note 4--and the reply I got was not helpful!

A

AC Question

I asked a question on this forum about being locked from getting into my phone after running the latest software update (Marshmallow). After my phone restarted, it asked for a screen pattern to get into my phone--which I did not have before! I've tried several patterns and how its asking me for my backup PIN, which I also dont know!! I asked for help on this forum and the reply I got was "Use Android device manager to lock the phone with your google account".

First, this reply does NOT make sense, as my phone is already locked!
Secondly, the Android device manager only works if your phone was registered prior to it locking you out. So this is not an option for me.

Is there any other advice I can get out there?? I see this same answer given to other people with my same problem yet I don't know how this helped them or the outcome. If there are specific details on how I can use the Android device manager to fix my problem, I would greatly appreciate any feedback.