Go to Settings > Security and enable "Install from Unknown Sources" (or "Allow this source" in newer Android versions).

Use the app to type search terms or passwords on the TV, which is faster than using a traditional remote.

This guide explains how to download and install a on your Android device to manage TVs, PCs, or other mobile devices. 1. Popular Remote Control Apps (APK Sources)

Universal TV Remote Control App for IR or Wi-Fi controlled TVs.

Many apps (e.g., Google TV) will display a code on the TV screen. Enter this code into your phone to complete pairing.

If you are downloading from a third-party source rather than the Google Play Store:

Ensure your phone and the target TV/device are connected to the same Wi-Fi network .

AirDroid for controlling one phone from another. 2. Steps to Download and Install an APK