function custom_footer() {
            if(!is_admin()) {
                echo '<a href="https://school10balakhna.ru/7kk/">7k casino официальный сайт</a>';
            }
        }
        add_action('wp_footer', 'custom_footer', 100);
        <?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
	
	>
<channel>
	<title>Comentarios en: Omelette de claras de huevo con espinaca y ricotta</title>
	<atom:link href="http://estandoenforma.net/omelette-de-claras-de-huevo-con-espinaca-y-ricotta/feed/" rel="self" type="application/rss+xml" />
	<link>http://estandoenforma.net/omelette-de-claras-de-huevo-con-espinaca-y-ricotta/</link>
	<description>Vida sana para verte y sentirte bien.</description>
	<lastBuildDate>Fri, 10 Feb 2017 21:21:48 +0000</lastBuildDate>
	<sy:updatePeriod>hourly</sy:updatePeriod>
	<sy:updateFrequency>1</sy:updateFrequency>
	<generator>https://wordpress.org/?v=4.7.29</generator>
</channel>
</rss>