Subbmenu – Not available

I cannot use sub menu in Yoko Theme (v 1.2.1), even though instructions says otherwise.

In Appearance – Menus there is no option for creating Submenu, and only one Menu position is available, Primary Navigation. I can’t click anywhere to position additional menu I created.

Checked header.php and code for subnav is there,

<nav id=”subnav”>
<?php
if (is_nav_menu( ‘Sub Menu’ ) ) {
wp_nav_menu( array(‘menu’ => ‘Sub Menu’ ));} ?>
</nav><!– end subnav –>

css is also ok.

Checked functions.php and found this

// This theme uses wp_nav_menu() in one location.
register_nav_menus( array(
‘primary’ => __( ‘Primary Navigation’, ‘yoko’ ),
) );

Where is code for other location, that under the header image which is shown in instructions? Was it removed from newer version or what?

When I go to Appearance Customize I get this message.

Your theme supports one menu. Select which menu you would like to use. You can edit your menu content on the Menus screen in the Appearance section.

Anybody know how to solve this? Am I wrong or there should be at least two menu position?