The only way to change the built in template is to edit the file on the
server (edit the admin/resources/email_templates/{template_name}/index.html file).
When you create a new template based off that, it does not affect
the built in one on the server, it creates a new one in the database
which only that user can see (and the admin user of course).
Once the new template is created, it won't show up under "built in templates", but under "templates" (manage templates).

The article has been updated successfully.