I got it figured out. If anyone is interested:
1) Go to "Template Manager."
2) Click on "Advanced Settings."
3) Add "Custom CSS" code, or if you are already making a great deal of CSS changes and are using the "override.css" file, input:
.gkIsWrapper-gk_creativity .figcaption h2 {
font-size: 16px;
max-width: 500px;
background-image:url(
http://www.yourdomain.com/path to image/image name);
background-repeat:no-repeat;
height: [input height parameter];
background-position:center;
}