If you made your images wide enough then the text will automatically show up under the image. If you don’t then it will show up on the side since the class that is added to the image is alignleft or alignright…..This is what the Genesis Framework (not the child theme) adds to those images. One way to fix it is to follow this tutorial – http://bit.ly/1nGzUAr and that will adjust the text in the way that you need.
