As there's no native RSS feed widget in Muse at this time you will have to use "Object > Insert HTML..." option to insert arbitrary HTML code for your RSS.
If you're not familiar with this option please read more here.
Cristian, the link you posted was an old one...i think...on that page are video-links...which are missing links..
i found something of a third-party, called bncscript...but i can't use the free version...
its a .rar file and i'm working on a mac...i get a screen full of unreadable codes..
The buy version cost 20 dollar, maybe that is an option...are you familiar with bnc script?
Yep, true! Sorry about those links, they were supposed to be active. I'm sorry I did not check them.
The action should be simple and straight forward as you can see in this recording here at ~ 4:00 and ~ 6:20. Unfortunately I don't have any experience with bnc script and cannot help you with that.