You can change the editor of the "Description" and each custom failed base on the available installed editor in your website.
Note: The current version (time of writing) does not allow the changing of introduction editor.
Default Editor Front-end: Default WYSIWYG editor for the user in the front-end of the site.Default Editor back-end: Default WYSIWYG editor for the user in the backend of the site.
Joobi has a two default editors:
If you want to use other Joomla supported editors, please install the editor first in Joomla.