Add Rss channel


I would like to add Rss channel to my web page. I followed( but i have a problem, because it does not work :( ( i’m quite new in Yii2).

I installed extension using compose and next migrated database (using php yii migrate, it created two tables: migration and rss_feed). And then i added module to config file, and pasted beforeSave() method…

Could anyone give me some information how to properly configure Rss (example)? I would be gratefull.