If you have a blog and you want to use rss as a content then you can easily create an RSS campaign by following the easy steps below:
Go to campaigns
Create RSS campaign
Select a name and the list or segment as a recipients of your RSS campaign
Fill in the details of sender, subject line, and the other settings if you want
Enter your RSS FEED URL. E.g https://wordpress.com/blog/feed/ and the number of posts, then click on save and continue
open drap & drop editor then drag RSS block and drop it
You can customize call to action "Read now" by using a button or text and change color or font (see image above)
Once done you can save and schedule your RSS campaign