You need to add a toolbar button item on the main screen to navigate to the new screen you are about to add. Drag a Bar Button Item from the Library tray and drop it into the right side of the main screen toolbar:
From Attributes Inspector, specify the Bar Button Item as the Add System Item:
For the new screen, choose Navigation Controller and View Controller from the Library tray and add them to Storyboard.
While holding down the Ctrl key, drag from the Add toolbar button in the main screen to the ...
