That is the s5 news display module, you need to post articles and link to a image check the tutorial out.
1) you need to configure the news display module to what you want
2)You need to upload image to what size you want
3)You need to add this to the article at the top <span class="s5_nd_image" style="display:none">http://www.yourimage.jpg
4) You need to enter in the module settings what article number you want to display