How to Hide WPtouch Mobile Plugin Admin Menus

function plt_hide_wptouch_menus() {
	//Hide the "WPtouch" menu.
	remove_menu_page('wptouch-admin-general-settings');
	//Hide the "WPtouch → Settings" menu.
	remove_submenu_page('wptouch-admin-general-settings', 'wptouch-admin-general-settings');
	//Hide the "WPtouch → Upgrade to Pro" menu.
	remove_submenu_page('wptouch-admin-general-settings', 'wptouch-admin-go-pro');
}

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

Where do I put this code?