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EDIT**
According to a video on YouTube
here you can validate via your Twitter account - Twitterfeed
As to try and help you I've gone ahead and created a twitterfeed account and
I've managed to validate
without any trouble http://prntscr.com/8g1czc however when I entered my standard URL www.midnightgaming.uk without adding the "/news/rss" it would not validate, as you can see
http://prntscr.com/8g1duw-----------
Moving on, so I've followed the 3 simple steps and created a active service...and guess what it works!!!
http://prntscr.com/8g1mzl &
http://prntscr.com/8g1oi8I surprise myself sometimes.




Right, so yeah..sorry pretty chuffed that I managed to get this working seen as i'm a newbie to RSS ROFL! Looks like you entered the wrong URL...I think*