trouble adding additional menu

Hi,
I’m having trouble adding additional menus to my wordpress theme.
The url:

http://www.mytechletter.com/MTLnew/thought-piece/this-is-a-test-for-thought/

I would like to have different header & footer navs, but I’m not sure what I’m missing here.

I’m working off of builder, and a child theme of builder. I’ve made sure that both my parent and child theme has the php of:
add_theme_support( 'menus' );

and I’m using custom templates which have the following placed in the header:

<?php wp_nav_menu( array( 'sort_column' => 'menu_order', 'container_class' => 'menutop' ) ); ?>

And I’m naming the menu ‘menutop’

Still my theme will only recognize one menu. Any help would be great.