Hello,
Thanks for getting in touch with us.
You can remove it the same way you added it.
Select what you added and remove it. Then, save the page.
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
The problem is I do not know it was added
Hello,
Thank you for contacting Rank Math today.
Just head to your page where RSS feed seems to have the code added and edit to remove it. If you wish to, we can take a closer look at the settings. Please edit the first post on this ticket and include your WP logins in the designated Sensitive Data section.

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 really look forward to helping you.
Hello,
I have updated the sensitive data as requested. Can you please check further?
Thank you.
Hello,
Thank you for contacting Rank Math today.
I am unable to replicate the issue. I have checked your RSS settings in Rank math and you don’t seem to be using if the available variables. Could you please clear your cache and check if you still have the issue. If so please share a URL of the affected post
Looking forward to helping you. Thank you.
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Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.