How do I use navigation controllers in conjunction with a tab bar controller?

Continuing the discussion from Storyboards Tutorial in iOS 9: Part 2:

I had an idea for an application that used a table view, when a cell is selected, that segues to a tab bar controller, I have two items, one of the items is a simple view controller and not having any issue with it. The other item is a table view controller. It displays the data okay. I want to add more items to the table. I added a bar button item, made it a Add button. When I run, the Add Item is not there. I’m not sure what I am missing.

@stryfe - Are you using any navigation view controllers in there?