Pressrow theme currently:
The current theme does not natively support menus, but you can use the “Custom Menu” widget to add any menus you create here to the theme’s sidebar.
This means that your theme has not been updated to support drop-down custom menus.
To navigate to child pages use a pages widget.
http://en.support.wordpress.com/widgets/pages-widget/
or experiment with the custom menus widget which will display in your sidebar:
http://en.support.wordpress.com/widgets/custom-menu-widget/
or check this out:
http://en.support.wordpress.com/menus/
Appearance -> Themes by choosing “Custom Menu” from the Feature Filters menu.
Currently, the following themes have this feature enabled: Twenty Ten, Structure, Vostok, Bueno, Enterprise, Notepad, Paperpunch, MistyLook, Under the Influence, Vigilance, Greyzed, Wu Wei, Blix, Cutline, Freshy, Contempt, Ambiru, Digg3, Koi and Modularity Lite.
When will the ____ theme have custom menus?
We’ll be adding support to more themes on an ongoing basis. In the meantime you can still play with custom menus on any theme by using the new Custom Menu Widget. The widget will let you add any of the custom menus you create to one of your sidebars/widget areas.