Not Clear on How to Add YouTube Videos

I’ve looked at a couple of past posts and what’s on the plugin’s site as how to add YouTube videos. Unfortunately, after trying several things, I still can’t get it to work and am obviously not doing it correctly.

On the plugin’s site, it says :

Add Script and Styles

Add the normal files for MediaElement.js.

<script src=”jquery.js”></script>
<script src=”mediaelement-and-player.min.js”></script>
<link rel=”stylesheet” href=”mediaelementplayer.css” />

Where do I add the above code and where are the normal files for MediaElement.js? Is this the only thing I need to add?

Add the YouTube video as a <source>
<video width=”640″ height=”360″ id=”player1″ preload=”none”>
<source type=”video/youtube” src=”https://www.youtube.com/watch?v=nOEw9iiopwI&#8221; />
</video>

I add this part to the text tab of my post/page. Correct?

https://www.ads-software.com/extend/plugins/media-element-html5-video-and-audio-player/