Hum, likely they were talking about the editor for tool bars.
When you are creating a menu bar, or a tool bar in ms-access, you can edit
the image. However, the icon editor is really only of use for editing a menu
bar, or tool bar icon. The results are not useful for creating general
icons.
There is a lot of free, or very low cost icon editors available out there
that are far better.
Anyway, go get to this editor, you can right click on a menu bar, and select
customize. You then can navigate to a menu/toolbar item and then right click
the menu item, and you will see among the options "edit button image".
All of the office programs (Excel, Word, Access etc) allow this.
