This article explains how to switch your joomla editor from normal wysiwig mode to html mode.

Sometimes you need to add youtube videos or other embedded information such as iframes into your website - this is when this skill is useful. Its also great for adding custom effects from uikit see http://getuikit.com/docs/core.html which On Targets websites all support!

First open your article then click the toggle editor button - I recommend the html button in the toolbar

Once opened this is the view you get

You can now do stuff like paste in your embed code.

You can also add images to your article - I recommend using the Images and Links Tab in the editor