Hello, I am trying to add popups to a StoryMap Journal. Instructions say to add the popup to the main stage, but nowhere do I see how to add the content for the popup. I want to create something like this right here: http://storymaps.esri.com/stories/2014/brazil-beyond-the-stadiums/ where you click on a spot and a nice photo or video pops up. You know, a popup. 
I have placed pins on the locations, but don't know how to create popups when they are clicked on. It says to "click a feature" but how do I add a feature? Aren't pins features? Help appreciated!
