How does this plugin work exactly? Please help.

It sounded like this plug was going to fix my problem but I’m not sure.

I have a sidebar widget where I’m supposed to input html. I put this embed code with a youube playlist and when I clicked save, the whole thing disappeared. Does anyone know how to use this plugin with the embed code below?

<iframe width=”560″ height=”315″ src=”http://www.youtube.com/embed/2NcBL6cYGL4?list=PLQPmRM4J2UhzbGLX_L-Sn6Vwe_ZRGzNpC&#8221; frameborder=”0″ allowfullscreen></iframe>

http://wordpress.org/extend/plugins/iframe/