I thought i post a part of my working RSS feed of NU.NL and TELEGRAAF.nl in the bottom bar of the MM.
So i made a connection to my RPI with puTTY by ipadres, and logged in as user PI with it password.
at pi@rasperrypi: you type cd MagicMirror [enter] , cd config [enter] , sudo nano config.js
scroll down until you see the newsfeed and alter them to this:
ctrl + o to save the file
ctrl + x to exit the file and return to prompt