Add the META robots noindex for better SEO and avoid duplicate content in Question2Answer forum.

qa-plugin.php

<?php
/*
	Plugin Name: SEO Custom Meta-Robots
	Plugin URI: https://qrokes.com/
	Plugin Description: SEO Custom Meta Robots
	Plugin Version: 1.0
	Plugin Date:
	Plugin Author: QROkes
	Plugin Author URI: https://qrokes.com/
	Plugin License: GPLv3
	Plugin Minimum Question2Answer Version: 1.8.0
	Plugin Update Check URI:
*/


if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
	header('Location: ../../');
	exit;
}

qa_register_plugin_layer('qa-seo-custom.php', 'SEO Custom Meta-Robots');

qa-seo-custom.php

<?php
/*
 * Add Meta-Robots NOINDEX to all pages except for homepage and question pages.
 */

class qa_html_theme_layer extends qa_html_theme_base
{
	public function head_metas()
	{
		qa_html_theme_base::head_metas();

		if ( $this->template=='question' || $this->template=='qa' ) 
			$this->output('<meta name="robots" content="index,follow"/>');
		else
			$this->output('<meta name="robots" content="noindex,follow"/>');
	}
}