TinyMCE
The default editor is TinyMCE, so we will start with that. There is an html edit button which will open an html editor popup window. Type your html or embed codes there. See image below

JCE Editor
JCE is the best Joomla editor in my opinion. I install it on every Joomla site. Instead of an html button, you can toggle editor and html edit view. Place your html or embed code in the html edit view

WYSIWYG
The WYSIWYG (What you see is what you get editor also has a popup html editor but the icon looks different. See image below.

If your editor is not above, don't worry, chances are it will use one of these methods above to get the html editor. If not, just look around, you'll find it





