Mobile site not working well

Hello, pls I need urgent help. I tried the free version of Focus theme before upgrading to the premium version. Since I upgrated my members have been finding it hard to navigate the site as all the navigation links disappeared under Menu, The problem is that on many phones when you click on menu, instead of showing a drop down menu with all the links, nothing happens. It’s frustrating. I prefer the earlier version where users can see the navigation links once they visit the site, instead of clicking on menu first before links are displayed.
here is the link to my site http://www.vnollynaija.com/icons

URL: http://www.vnollynaija.com/icons