Theme Horse

Hi kai,
If you want to display submenu items too then you need to create it from page. I will show you screenshot. Just have a look
http://awesomescreenshot.com/0fa43rqw73

How to create child Page ? view this screen shot

http://awesomescreenshot.com/0eb43rr64a

Those page you select parent for blog will be displayed as child.

Thank you!