Twenty Ten Theme editing Homepage?

Homepage is listed in the bottom left hand corner of the image header, yet I can’t find the page when I look in Edit Page listing – only the About page is there?

I want to add content to the Homepage. When I go to the Pages to edit, I can add a new Homepage, but it is a duplicate page name.

How do I add content to the page that is listed (how do I gain access) in the image? Can’t seem to find the connection?

I assume that Homepage is somehow linked to Index.php – I find three separate ones of these in different directories one under root which I assume is the default homepage?

Thanks for any help,

Tim