On the Success homepage, there is a neat grid of 3 posts - here's a quick way to display 4 instead like so:
1) First, simply update the shortcode to the following:
[display-posts posts_per_page="4" image_size="large" include_date="true" date_format="F j, Y"]
2) Next, when editing that same text block, scroll to the bottom and you'll see an 'Extra class name' field. Change this to 'grid-of-four'