You can use the YouTube app built in to Google Fiber TV to watch YouTube content just as you do on your computer or other Internet-connected device. You can use the generic version, or you can sign in to access your subscribed channels or YouTube Red subscription.
To watch YouTube content:
Press on the remote control, select Apps, and press ok.
On the Apps page, select YouTube and press ok.
To exit the YouTube app:
Press on the remote. Or, press on the remote until you see the exit confirmation message. Then select Exit and press ok.