To add a RSS feed to your website. You first need to make sure that the RSS feed is valid. You can go to this link and validate the RSS url.
To add the External RSS feed just follow these easy steps;
1. On your website’s Control Panel click on the Pages tab.
2. Hover on Settings of the page where the Feed widget will be added, click ’Manage Widgets’
3. At the "Add a new Widget" box click on the " External RSS Feed Content"
4. Add in the RSS feed url at the RSS feed url box
5. Click on "Create".
Congratulations! You have added an External RSS feed widget to your site.