Overriding default themes files in my custom theme

I have a child theme I am working on (off a modified version of Starkers theme) and I want to customise the Directory Author page.

When I visit the page it says:

* The template for displaying Author Archive pages.

* You can override this file in your active theme.

How do I do this? I tried copying the file into my child theme folder and didnt work. I also tried copying the file to my parent theme folder and didnt work :slight_frown: