Delete rss feed

I discovered that I have two rss feeds. One that ends in /?feed=podcast and the other ends in /?feed=rss2. I want that one that ends in /?feed=rss2 deleted. I found it by doing a simple google search. I have it selected on my site for it not to be searchable by search engines. How do I delete the rss2 feed and not the other

I’ve searched the forums and tried some other steps, but it always deletes both feeds and not the one. HELP! 🙂