"no I can't post HTML"
This is the HTML encoded version of the link.
All you need to do usually is to bracket the URL (in double quotes) like this
<A HREF="https://youtu.be/LesWfbkJJlQ" >
Followed by the string of text you want to show as covering the link
then add </A> after that text to terminate the link section
Use the "Preview" button to check the HTML has been recognised as correctly formatted.