Hi I am brand new to Zenphoto so forgive any stupid oversight. I've searched the forums and the docs and cannot see how to change a theme. I've seen references to theme.txt but a search of folders on the webhost cannot find any such thing.
And people talk about a Themes tab in Admin options - and again I can't see this. I have a section Theme for Gallery: Default but nothing changeable about the theme used.
So anyone know how to change the theme from Default?

You need to visit your administration page. This would be www.yourdomain.com/zenphoto/zp-core/admin.php assuming that you installed zenphoto in a folder named 'zenphoto'. There you will see a page with several tabs along the top. Click on the one that says 'themes' and you can change the theme.

Thank you very much sbilliard. Yes I go to mydomain.com/zenphoto/zp-core/admin.php. And there I have a page with two tabs across the top. One is Options and the other is Plugins - which seems to be the same page as Options. There is no Themes tabs. Am I missing one or more tabs here? Was this a bad install perchance?

Yes bad install. Just wiped the database and zenphoto folder and started again. This time lots of tabs including Themes. Thank you.