To play a youtube video, first of all the room owner must give you permission to do so. Once you are setup to do so, you must log in to the room. Once in chat, make sure you select "All" (if you select a person then the video will play only for that person): @video play youtube_url (Room owner should have granted you permission to do so and you have to log in as a room member). Youtube urls must be in one of three formats:
To play a single video. Note the bold and colored part of the URL: https://www.youtube.com/watch?v=87rhZTumujw
To play a youtube playlist. This gets complicated. Youtube has mixes and playlists. A playlist is a fixed list of songs while a Mix is a list of songs based on some theme. The other big difference is that when you play a playlist, then everyone gets the same song. When you play a mix different people may get different songs. The URLs for the two are similar thus making this confusing.
For a playlist note the letters PL in the URL. https://www.youtube.com/watch?list=PLn4GvABOzCQursVQ7qMU9CkNaKz4RgrVM
For a Mix note the letters RD in the URL. https://www.youtube.com/watch?list=RDQMHIn4IannryI
Lookout for these subtle differences when you post a video or a playlist.
To toggle off the youtube screen: @video off (Room owner should have granted you permission to do so and you have to log in as a room member).