Which file to add new menu code to?

Hi, I'm trying to add another menu bar to my site since the default NepalBuzz theme only supports 2 menu locations. I added this code snippet to my functions.php and it worked great: function register_my_menu() { register_nav_menu('new-menu',__( 'New Menu' )); } add_action( 'init', 'register_my_menu' ); Now the instructions say to add this code to the header.php page to place the menu where I want it: wp_nav_menu( array( 'theme_location' => 'new-menu' ) ); ?> However, I can't get the menu bar to show up how I'd like. I want the new menu bar to be ABOVE the main sticky menu at the very top of my site. I tried adding the code snippet to the bottom of the header.php page, and it showed up at the top of the main container of my site. I tried adding it at various other points in the header.php file and it just caused errors. I know there's another file in the NepalBuzz directory called menus.php. Is this where I should be adding this code snippet to place the menu where I want it? If so, where? Sorry, I am not well-versed in PHP. Thank you for any help!