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// function.php

// This theme uses wp_nav_menu() in one location.
register_nav_menus( array(
	'menu-1' => esc_html__( 'Primary', 'b2w' ),
) );

  //header.php
<?php
  wp_nav_menu (array (
    'theme_location'  => 'primary',
    'container'       => 'nav',
    'container_class' => 'navbar-collapse collapse',
    'menu_class'      => 'nav navbar-nav navbar-right'
  ));
?>