My menu will not appear on my homepage

Hi,

I am trying to make a simple navigation menu appear on my website. The website is https://www.inexadvisors.com.

I made the menu through Appearance>Menus and it does say “Your theme supports 6 menus. Select which menu appears in each location.”

I am choosing to do a header menu, I created a menu with 4 items called “Main Menu” so I select main menu from the drop down and then I save everything. I just cannot get it to appear on the page!

Do I need to install a plug in? If so, how do I get this to work?

Any help would be greatly appreciated.

https://www.ads-software.com/plugins/menu/