Let tell you what I have done it.
when I need a feed I go to the New Post and then click on the rss feed icon and then enter the URL it ask and then submit , right then enter the content on the new post and update. If this is not the way then please do let me know how.
Thanks
Gary
click the link for instructions.
https://docs.themeisle.com/article/658-feedzy-rss-feeds
Thanks
Gary
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