Custom Menus

How can I add custom menus in the new update?

In the previous version I added my custom code in menu.phtml

Between these 2 sections of code:
if( isset( $data[‘RMHtml’] ) && $data[‘RMHtmlLoc’] == ‘above’ )
self::additionalContent();

if( !$data[‘RMSearch’] && $data[‘RMSearchPos’] == ‘above’ )
self::searchBar();

/* HERE */

if( !$data[‘RMSearch’] && $data[‘RMSearchPos’] == ‘below’ )
self::searchBar();

if( isset( $data[‘RMHtml’] ) && $data[‘RMHtmlLoc’] == ‘below’ )
self::additionalContent();

Now I attempt the same and I have the menu showing up twice!
My custom menu and my original responsive menu

Thanks

https://wordpress.org/plugins/responsive-menu/