Hello @TomD71 ,
Are you trying to add this to an email? Unless you're building a custom code email, you won't be able to add code to anything. Wordpress is a website builder, so that would function differently from an email built in our system. Please also keep in mind that RSS feeds aren't available for emails due to their likelihood of triggering spam filters.
If you're just looking to add a little visual graphic to your email for regular updates, that's as simple as adding an image.