Ensure your iPhone and your target device (Smart TV, FireTV, etc.) are connected to the exact same Wi-Fi network. The app uses local network protocols to discover your devices.
When you first open the app, you must allow "Local Network" access. This is required for the app to "see" and communicate with your devices.
Tap the "Scan" button. Once your device appears, select it. Some TVs may show a pairing code or a prompt to "Allow" the connection. Accept it on your TV screen.
Use the touchpad or D-pad to navigate. For FireTV apps, you can use the voice button to trigger Alexa commands directly from your phone.