YouTube being one of the most widely accessed platforms, offers music, movies, sports, news and much more. If you like to activate YouTube on Roku, then visit the channel store and add the channel onto your Roku account.
As this is a free app, it does not involve any activation fees. However, in order to link the device to an existing YouTube account, you may have to login from your Roku device and perform the youtube.com/activate procedure to stream it right away.