Sounds like the right answer, BUT when I have finished Step 3, there is no option to tap for "not this person".
What am I missing? Just recently upgraded to iOS 10 on an iPhone 6. Wait, I found it. You need a step 3.b.
It is not intuitive to tap the "share" icon as if you were going to post, etc. But when you do, THEN there is a choice that says "not this person."
Maybe people like me need to change what I call that icon (box with an up arrow). It would have been more helpful if I had mentally thought of it as "Actions". Anyway, problem solved. Instructions should be more helpful to others now.