How do you add a device to YouTube TV?

To add a device to YouTube TV, begin by ensuring the device has a stable internet connection and access to the YouTube TV app. Launch the app on the desired device, and navigate to the settings or account section. From here, select the option to link the device. You will be provided with an activation code on your screen. Using a separate device such as a mobile phone or computer, go to tv.youtube.com/start or the link indicated on your screen, enter your Google account credentials if prompted, and then input the activation code displayed on your TV. Once you have followed these steps, your device should be successfully linked to your YouTube TV account, allowing you to stream content through the newly added device.