You can install the LG ThinQ app on your Android or iOS device by going to the Google Play Store or App Store. Select LG ThinQ and install it. You'll be directed to a screen where you can sign in using your LG account information. Tap Sign In and agree to the terms of service. After you sign in, install the LG ThinQ app. You'll be brought back to the main menu. The LG ThinQ app enables several features, including: 1. Change the input on your LG TV with the LG ThinQ app. You can change HDMI inputs on some functions in the app. You can also use it to control your TV's sound, whether using Bluetooth for wireless audio or a wireless USB Bluetooth device. 2. Connect the TV and other smart devices, such as Roku. You can connect your TV and other smart devices using HDMI-CEC. If you're using a screen mirroring device on your phone or tablet, you'll be able to view content on both devices using the app.