By default, the footer widget titles will be set in Theme Options> Typography Settings, and setting your h4 fonts.
To set them separate of your theme options, add this CSS to Theme Options> Advanced Settings, or Theme Options> Custom CSS. Customize your font properties to the CSS as needed.
[css]#containerfooter h4.widget-title { font-weight: bold; font-size: 30px; }[/css]
[columns] [span6]
Footer Widget Title Default:
[/span6][span6]
Footer Widget Title CSS:
[/span6][/columns]