IFrame button is not in the editor layout after install
Joomla 3: Fix Problem With JCE Editor Not Showing Format Buttons - YouTube
Editor button plugin
Uploading and linking to files within articles using JCE Editor PRO
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.
JCE 2.8.0 RC 19 Joomla buttons not included in stand alone SP Page Builder
JCE: Using the “Read More” Button
How to extend functionality of TinyMCE editor?
How to add the online ordering button in Joomla | GloriaFood Blog
How to use Joomla text editors?
Inserting the "Read More" Button (Joomla 3)
How to enter raw HTML in the Joomla! editor - HostPapa Knowledge Base