How to Hide the "WPS Hide Login" Admin Menu

function plt_hide_wps_hide_login_menus() {
	//Hide the "Settings → WPS Hide Login" menu.
	remove_submenu_page('options-general.php', 'whl_settings');
}

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

Where do I put this code?