Hello,
I've just started using ZenPhoto in my Website to post all my photos. I'd like to know if I can add a menu tab that will route me back to the main website. I'd rather not have to hit the back arrow button over and over again to get back to the website. Right now I'm using one of the default themes and I know that I can't edit it. If there is a theme available so I can customize a menu tab please let know where I can find that. Your help is greatly appreicated.

Thank you.

I don't understand? You can of course edit standard themes. About what "menu tab" are you talking by the way?

You can use this function to add such a button or a manual link:
http://www.zenphoto.org/documentation/functions/_template-functions.php.html#functionprintHomeLink
The link itself is defined on the options.