Settings in this section of Control Panel are recommended for advanced users, with previous experience with HTML and CSS. It is possible to edit templates directly from the system or to copy and edit in an external HTML editor before inserting customized template back into the system. Option “Revert” is getting the system back in previous state, before the template is modified.
Editing boxes does not require knowledge of HTML since all the changes are made directly in the built-in visual editor. All the user needs is to be careful about changes made not to distort look of the web site.