Themes » Editing Templates and Themes
You cannot edit the core files (PHP, HTML) of any template or theme directly. This functionality is only applicable to privately-hosted blogs and sites using the WordPress.org software. If you require this functionality and would like to consider WordPress.org, suitable hosts can be found here.
If you purchase the Custom CSS Upgrade you can modify the stylesheet of any theme. Moreover, the Sandbox theme allows a great deal of flexibility and is a great option for skilled CSS artists looking to heavily modify the look and feel of any blog.
The Custom CSS Upgrade, however, does NOT grant you the ability to edit the core template files of any theme.
