wp_nav_menu - add class on UL

Question

I am learning wordpress together with bootstrap and somehow I can\'t add class on UL tag.

In the screenshot, I want t

Answer 1

Update: this was caused by the fact that i didn't have a menu created in the menu page.

I want to add a class to the ul of wp_nav_menu. I tried this code:

 'menu',
    'items_wrap'      => '
%3$s
',
);

wp_nav_menu( $defaults );

?>

According to wordpress codex changing the menu from 'menu_class' => 'menu', should change the class of the ul, but instead it changes the class of the div wrapping the ul.

Sample Page