Could you confirm that you are asking about the button which I marked in the following screen shot http://screencast.com/t/CR0cLeP8
You can control the editing modes of RadEditor by setting the EditModes
property in the respective ConfigFile.xml or ListConfigFile.xml (Set Properties Via Config File
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.