How do I connect my PlayStation App?

How do I connect my PlayStation App?
Mobile App Connection Settings

Connect your smartphone or other device and your PS4™ system to the same network.
On the PS4™ system, select (Settings) > [Mobile App Connection Settings] > [Add Device].
Open (PS4 Second Screen) on your smartphone or other device, and then select the PS4™ system you want to connect to.

Mobile App Connection Settings
  1. Connect your smartphone or other device and your PS4™ system to the same network.
  2. On the PS4™ system, select (Settings) > [Mobile App Connection Settings] > [Add Device].
  3. Open (PS4 Second Screen) on your smartphone or other device, and then select the PS4™ system you want to connect to.