What widget class name should I use in header.php?

Hi,

I would like to replace the default main nav bar on my website with one created using this plugin. My website is built on the “Foxy” theme by Elegant Themes. I contacted Elegant Theme’s tech support for assistance on how to do this and here’s what I was told:

Replace this text in the header.php file

<?php
	$menuClass = 'nav';
	if ( 'on' == et_get_option( 'foxy_disable_toptier' ) ) $menuClass .= ' et_disable_top_tier';
	$primaryNav = '';
	if ( function_exists( 'wp_nav_menu' ) ) {
	$primaryNav = wp_nav_menu( array( 'theme_location' => 'primary-menu', 'container' => '', 'fallback_cb' => '', 'menu_class' => $menuClass, 'echo' => false ) );
	}
	if ( '' == $primaryNav ) { ?>
	<ul class="<?php echo esc_attr( $menuClass ); ?>">
	<?php if ( 'on' == et_get_option( 'foxy_home_link' ) ) { ?>
	<li <?php if ( is_home() ) echo( 'class="current_page_item"' ); ?>><a>"><?php esc_html_e( 'Home','Foxy' ); ?></a>
	<?php }; ?>

	<?php show_page_menu( $menuClass, false, false ); ?>
	<?php show_categories_menu( $menuClass, false ); ?>

	<?php }
	else echo( $primaryNav );
	?>

with

<?php the_widget('Widget_Class_Name'); ?>

My question to you is, what widget class name do I need to use for the above code to function properly?

Thanks so much!

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https://wordpress.org/plugins/jquery-mega-menu/