How to Hide the "Verse of the Day" Admin Menu

function plt_hide_verse_of_the_day_widget_for_wp_menus() {
	//Hide the "Settings → Verse of the Day" menu.
	remove_submenu_page('options-general.php', 'verse-of-the-day-widget-for-wp');
}

add_action('admin_menu', 'plt_hide_verse_of_the_day_widget_for_wp_menus', 11);

Where do I put this code?