Windows 8 News and Sports Apps: Adding/Removing Sources

...I'm trying to figure out why there is no clear-cut way of doing this. I hope there is, because that's pretty basic functionality for an app like News/Sports.

And I don't mean searching a topic under "my news" and getting it filtered through their sources. I mean taking sites like IGN and Kotaku out of the gaming feed (I REALLY hate those sites) and adding in GameInformer or Polygon.