[Y ] and [/ y] (without the spaces of course). And all you need to enter is the video code, not the whole url. For example, this is the link to the video:
https://www.youtube.com/watch?v=Mn0b_0ImRdk
v= refers to the video id that youtube uses, so all you need to enter is Mn0b_0ImRdk
If you try and edit the article you'll see how I changed it
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