To edit a template's files with the Template Manager you must first access the Template manager.
You will now see the Template Manager screen.
Note: If you do not see Template Manager listed as an option on the Extensions menu, then it is most likely because you are not logged in as a Super Administrator. Only Super Administrators will see this menu item.
Since Joomla! 3.2, there are two methods available for accessing the Template Manager: Cutomise Template. The Cutomise Template interface allows for editing the actual code found in the template files, creating layout overrides and template file manipulation.
Remember: Styles refers to changing the available parameters of a template, such as color, font-color, logo, etc. These are dependent on the parameters a template maker made available and are a convenience for quick changes.
To access the Template Cutomise feature: