Remove additional menu on mobile version

forgive me… first timer here…

I’m good with my desktop site but on the mobile version there is an addition menu (top right box that say menu) – how do I get rid of that- or make it so the mobile just has one menu instead of the two. I’m using 2016 theme…
and would very much like to find a plugin for this as I’m not comfortable using css yet (sorry sorry)

The page I need help with: [log in to see the link]