You need to make changes in the below file.
vendor/magento/module-theme/view/frontend/templates/html/breadcrumbs.phtml
<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
// @codingStandardsIgnoreFile
?>
<?php if ($crumbs && is_array($crumbs)) : ?>
<div class="breadcrumbs">
<ul class="items">
<?php foreach ($crumbs as $crumbName => $crumbInfo) : ?>
<li class="item <?= /* @escapeNotVerified */ $crumbName ?>">
<?php if ($crumbInfo['link']) : ?>
<a href="<?= /* @escapeNotVerified */ $crumbInfo['link'] ?>" title="<?= $block->escapeHtml($crumbInfo['title']) ?>"><?= $block->escapeHtml($crumbInfo['label']) ?></a>
<?php elseif ($crumbInfo['last']) : ?>
<strong><?= $block->escapeHtml($crumbInfo['label']) ?></strong>
<?php else: ?>
<?= $block->escapeHtml($crumbInfo['label']) ?>
<?php endif; ?>
</li>
<?php
//custom code by John
//your customer code here,
if ($crumbName == "home") : ?>
<li class="item">
<a href="Your static link here" title="">Your static link title here</a>
</li>
<?php endif; ?>
<?php endforeach; ?>
</ul>
</div>
<?php endif; ?>
see above and make the necessary changes in the same file.
Note: it will be preferable if you can override this file.
How to override .phtml files in Magento 2
Also, change href link and title on the above code.
To check if the current page is cms page or category page
Magento 2.2.2 how to check if current page is a CMS page in .phtml file?