Sorry, but you’re using a premium/paid theme from Theme Forest. It’s best to go to the support site where you bought the theme for help with customizations and issues. These forums are for themes available in the WordPress theme directory at wordpress.org/extend/themes/.
Your theme loads 27 scripts and I see 4 JS errors alone; the theme must not be 3.5 compatible. Switch to twentyeleve for a minute and see if you regain menu functions.