Sponsor Message Inside Feed Items
Places a short sponsor or promotion message after the first paragraph of every item in your feeds, where RSS readers and RSS-to-email newsletters will show it.
Snippet Library
RSS Feeds snippets for WordPress
Snippets for WordPress RSS feeds: add featured images and custom post types, delay publishing to feeds, credit your site on scraped content or turn feeds off. For publishers and podcasters whose readers follow along by feed or email.