Example: The URL is  https://www.youtube.com/watch?v=rWkVS9qxBmg  .

The id is the text after  v=  and up to the next  &  or the end of the URL.

Here:  rWkVS9qxBmg  .

2. Embed the Video using the id

2018-01-19 by Mathias Schreiber