Buttons
Background Color
This button changes the background color of the selected "field". If you use this button with text that isn't within a table field, then the entire background of your text area will change to the selected coler. If you use this button on text that's in a table field, then only that field will change to the selected color.
Create Link Anchor
This button allows you to create links that point to other sections within the same page.
Insert Image
Allows you to insert an image into your document that is stored within your Plone site.
Access Toolbox
The toolbox is a dialog box that lets you find documents within your Plone site and link to them.
External Links
http://staging.onenw.org/documentation/quickstart/epoz - This page has more information on each Epoz button.