You must first create a YouTube item in the Library and then set the Video Id parameter with one of the following:
Full YouTube URL (eg, http://www.youtube.com/watch?v=IiiMTXCcv6U)
or just the video identifier (eg, IiiMTXCcv6U)
After adding the item to the Ubisign playlist, you can set additional parameters such as the volume and duration, which must be manually set to match the original video duration.
At playback time, the video may not start immediately, which is usually due to Internet access conditions, especially in the case of HD videos. However, the video start time is likely to reduce as the channel repeats the programming block.
IMPORTANT: Some videos may not play at all, which is due usually to embedding restrictions imposed by the video author.