Download the SHIELD TV app from the iOS App Store or Google Play Store. Make sure your phone is connected to the same network as your SHIELD and launch the app. Select your SHIELD from the list and follow the on-screen instructions to complete pairing.
With the new SHIELD TV app, you can
Navigate SHIELD using D-pad or swipe pad
Directly launch apps
Locate lost SHIELD Remote (2010)
Use mouse keyboard to navigate GeForce NOW UI