Navigation Menu is Disappearing on Mobile Devices

I’m having a problem with my navigation bar. It appears where it’s supposed to on desktops, but when I open it in on mobile devices, it disappears or functions improperly.

I used these directions to move the navigation bar below the header https://en.forums.wordpress.com/topic/move-navigation-bar-in-the-theme-twenty-twelve-below-header-image

My site is innolaeventsanddesign.com . The coming soon page is up – so let me know when you need to view it and I’ll temporarily take it down.
Thank you.