How to Hide the "Social Icons Widget Settings" Admin Menu

function plt_hide_social_icons_widget_by_wpzoom_menus() {
	//Hide the "Settings → Social Icons Widget Settings" menu.
	remove_submenu_page('options-general.php', 'wpzoom-social-icons-widget');
}

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

Where do I put this code?