administrator - How do I preview an article in Joomla editor? - Joomla Stack Exchange
Inserting the "Read More" Button (Joomla 3)
The JCE Editor Toolbar provides over 50 different commands and plugins, each represented by a button or drop-down list with which you can style and enhance your content.
Tutorial #9: An Overview of the JCE Editor (Joomla 2.5)