One is usually supposed to use the html iframe tag to do this:
<iframe width="560" height="315" src="http://www.youtube.com/embed/-iFeC7R3Tfg" frameborder="0" allowfullscreen></iframe>
or a WordPress shortcode like this:
It turns out, neither of these worked. Instead, I used the WordPress Video Plugin. This is easy to do. If you know how to administrate WordPress, click on “Plugins->Add New”. Then search for “WordPress Video Plugin”. When you find it, click on “Install Now”. After it installs, click “Activate”.
After you have finished installing and activating it, in order to embed a youtube video, use the following format:
id is the identification youtube uses to uniquely identify the video. If you look at the failed attempts above, it would be the part in bold.
Causing the use of the WordPress Video Plugin to embed the video from the last post to look like this:
You can find details about how to embed other videos using the WordPress Video Plugin here.