It seems from the screen shot you are not clicking the Green + button next to news and instead you are clicking the Add Content button. If you want to add more articles, click the green + button next to News. So you will have something like this:
News
- Article 1
- Article 2
- Article 3
When you click the Add Content button you are actually adding a region to the page, and you will need to modify the page to show that region.