Hello,
Thank you for your query, and we are so sorry about the trouble this must have caused.
You can add Rank Math’s breadcrumbs code to your theme’s template files, and the breadcrumbs will appear on your website’s front end accordingly.
Editing the theme files directly could be difficult for beginners and cause adverse effects if not handled correctly. Hence, we always recommend using a child theme.
Depending upon the theme you use, the theme file where you should add the breadcrumbs function would vary.
Here are the links for more information:
https://rankmath.com/kb/breadcrumbs/#theme-template-files
https://rankmath.com/kb/breadcrumbs/#add-breadcrumbs-theme
In most themes, it would be either the single.php file or the header.php file.
But in case if you’re unable to figure it out, you can check with your theme developer or edit the first post on this ticket and include your WordPress & FTP logins in the designated Sensitive Data section.
Please do take a complete backup of your website before sharing the information with us.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:
https://wordpress.org/plugins/temporary-login-without-password/
You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):
https://wordpress.org/plugins/wp-security-audit-log/
We hope that helps, and please don’t hesitate to get in touch if you have any other questions.
Thank you.