If there is a particular page that you want to edit (i.e. areas that are not designated as editable by the template) then you could choose to detach that page from the template by going to:
Dreamweaver Menu > Modify > Templates > Detach from Template
(Pages can be re-attached too).
I tried to find the templates page you mentioned but there is not a single page that is not locked. I searched every file (I think I got them all) and could not find a single file which was not locked. As you mentioned I only want to change the template as I only want to edit major items and not individual pages. Can you please explain where I would find the unlocked template files