Change font sizes on slider

You can add some CSS. You will need to first install a Custom CSS plugin like Jetpack or Custom CSS Manager. Don’t edit any of the theme’s files or your changes will be lost the next time you update the theme. You can also create a child theme, but that’s a lot of extra work if all you are doing is adding some CSS rules.

Once you’ve installed a CSS plugin, add these two rules:

/* This is for the slide's Main Caption */
#slides article .mainCaption {
   font-size: 34px;
}
/* This is for the slide's sub caption */
#slides article .subCaption {
   font-size: 18px;
}

The values that you see are what is currently in effect. Make them bigger or smaller to suit your needs.

thanks! that worked great!