When you edit a page, you can either view the regular Editor view, which allows you to modify the front-end, or the HTML/Code view, which allows you to configure the editor text box from its code source.  

Instructions

1. Navigate to the desired page
2. Ensure Live Edit is turned on
   
3. Click into the Editor by clicking anywhere in the Editor container area
4. Select the Code View icon on the second row of the toolbar
   
5. You are now in the HTML view of the Editor