To add MacRumors to your news, open macrumors.com on safari, click the "arrow" (share) button, and click "Add to News".
But I'm guessing that if you read that you've probably already done it!
No, I didn't know that. Thank you, thank you, thank you! I frustratingly tried adding my favorite blogs through the app itself with no luck. After searching the web for "iOS 9 News" and getting nowhere - think of how many articles comeback with that search! - I was ready to file it away like most of the gimmick apps Apple has tacked on the last few years.