Go to the video on YouTube and in the URL, copy the numbers and letters after v= ... for example, a URL would be https://www.youtube.com/watch?v=_OBlgSz8sSM ... Rather than just posting the link, copy the _OBlgSz8sSM and type [youtube] before it and [/youtube] after it. so, it will look like this [you.tube]_OBlgSz8sSM[/you.tube]... (don't include the periods between youtube)