How to Set Up an RSS Feed for Blogs
Navigate to Sites > Blogs.
Once you are inside Blogs, go to the Settings (gear icon) of Blogs.
After going to Settings, there will be an option to go to the 'RSS' tab.
You can control how many blog posts you would like included in your RSS Feed in the RSS tab. You can adjust the number accordingly for more or fewer posts.
Maximum allowed blog posts will be 100