I am running Holi a child them for Twenty Thirteen.
The menu is working great on a desktop. The pages are listed next to each other in the header.
However, when I look at the site with mobile phone (iPhone), all you see is "MENU" and an arrow that looks like it should be a dropdown to show you the page options. When you tap the arrow to get the drop down, nothing happens. When you tap "MENU" nothing happens.
How do I get the MENU to actually dropdown on a mobile phone?
I am a very very beginner with code so step by step instructions would be greatly appreciated!