We recommend that you use the Atto editor as it is more modern, gets updates and simply looks better.
If you are switching from TinyMCE to Atto you will have to run an update script for your embedded objects. This is described in detail on the atto editor page.
To activate the edu-sharing option for the Moodle-WYSIWYG editor, navigate to "Site administration" > Plugins > Text editors > Manage editors.
managing the Moodle editors
Activate the „edu-sharing HTML editor" by clicking on the eye-button (enable); move it to the top of the list by means of the arrows (Up/Down).
moving the edu-sharing HTML editor