YT link tutorial since some people still dont know how to do it
The tags are [YOUTUBE]YT link here[/YOUTUBE.] (Without the dot)
As an example let's use this link: https://youtu.be/iRT4bUl2iFA
If you try putting the entire link inside the tags it won't work.
What you need to do is take the part that comes after the =, in this case that is iRT4bUl2iFA.
Now just insert that inside the tags and there you go.