newsupernova/app/code/Magefan/Blog/view/frontend/templates/sidebar/rss.phtml

<?php
/**
 * Copyright © 2015-2017 Ihor Vansach (ihor@magefan.com). All rights reserved.
 * See LICENSE.txt for license details (http://opensource.org/licenses/osl-3.0.php).
 *
 * Glory to Ukraine! Glory to the heroes!
 */
?>
<?php
/**
 * Blog sidebar archive template
 *
 * @var $block \Magefan\Blog\Block\Sidebar\Rss
 */
?>
<div class="widget block block-rss" data-bind="scope: 'blog-rss'">
    <div class="block-title">
        <img width="17" height="17" class="rss-icon" src="<?php echo $block->getViewFileUrl('Magefan_Blog::images/rss-icon.png') ?>" alt="<?php echo __('RSS Feed') ?>" >
        <strong><a target="_blank" href="<?php echo $this->getUrl('blog/rss/feed') ?>"><?php echo __('RSS Feed') ?></a></strong>
    </div>
</div>