Post Grid population

I was not able to see where to respond in the last post, sorry.
My next question is where does the plugin grab the information that it posts. You mentioned meta fields, but I am not sure what you mean by that.
I just need to know where I need to put my news articles in so that the plugin ONLY posts these and not our other shows or podcasts as it seems to do now.
I ONLY want the daily world news to be in this plugin, not our sports shows, comedy etc which it seems to be populating at the moment. 
Thanks