To be able to add a new Contact, you need to add the Contact editing screen back in to the Storyboard. You will add a special Add button with a plus sign that will display the Contact editing screen.
1. Open Storyboard and select the Table View Controller.
2. Drag a Bar Button item from the Object Library to the navigation bar and drop it to the right of the text Contacts. Before dropping it, you should see a blue rectangle appear on the navigation bar. Drop it into this rectangle.
3. Use the Attributes Inspector to change the Identifier to Add. This changes the button to a plus sign.
4. Control-drag from the Bar Button item to the Contact editing screen and select Push. This sets up a segue between the Table View Controller ...