Colors

You need to override the plugin’s stylesheet with your own styles. Therefore you have to edit the style.css of the theme that you are using. Try something like:

.slideshow-info {color:red}

.slideshow-caption {color:red}

In case the override doesn’t work you may try (although it’s not a good way to do it):

.slideshow-info {color:red !important}

.slideshow-caption {color:red !important}