This graphic shows the difference between single and multi-valued slots and the difference between simple and WYSIWYG editor enabled text fields. When you click in a multi-valued slot, the slot toolbar displays the Edit option which you can click to work with the individual slots within the multi-valued slot. When you click in a single-valued slot, the toolbar that appears is only for modifying the content in that slot. When you click in a simple text field, you will see a simple text area and when you click in a WYSIWYG enabled field, a WYSIWYG editor field is displayed to you.