You can make a few modifications to your article by using the step inspector and the document inspector. I'll only cover three here, but you are welcome to explore them a little more if you'd like.
Click on the document inspector and check off "Auto-number Steps"
Now your steps have numbers next to them
Each step has a number next to it. If you want to move a step to a different location, just click and drag the steps in the left-hand side bar.
Change media position and type
Click on the step inspector and you can change whether the screenshot goes above or below the paragraph text. You can also include video embed code so YouTube, Wistia, or Vimeo videos can play in a step. See here for more details about that.