i understand what your talking about after you put the template page of posts, the event and value is NOT in the code it is in the page editor. I have a picture here https://i51.tinypic.com/28lf0wx.jpg
Simply in the “name” part always write category, then in “value” you put in the category of the posts you want to show on the page such as blog. Then it will only display posts with that category.
Hope this helps