By using the RSS Feed Manager you can add more content to your sites by using RSS feeds from other sites that are targeted to your niche.
You can also use it to promote your other sites or this site if you have RSS feeds set up for the content so it can be displayed across your site.
The RSS feed Manager is to manage all your RSS feed where you add your feed url and other particulars in the settings give below.
Then it will display the data from that feed url based on the settings you do while adding the RSS feed.
Then you can generate the RSS feed code and can be added anywhere in the site template left/right or bottom bar, or on static pages. You can even use this code to publish the RSS feed on other sites.