Install via the Control Panel or via composer
composer require sortarad/rssAdd widget to control panel configuration config/statamic/cp.php file.
e.g:
[
'type' => 'extra_extra',
'width' => 50,
'url' => 'https://statamic.com/blog.rss',
'limit' => 5,
]