Hi Chearsten Webb
Thanks for contacting us.
1. For change the color of caption title and description, add the below css code in Additional CSS box, Please go to the Appearance => Customize => Additional CSS then paste the CSS here and click to Publish button.
.theme-slider-content .theme-caption-bg .title-large {
color: #FF0000;
}
.theme-slider-content .description {
color: #FF0000;
}
You can change the color as per the your need.
2. Do you want to bold the title and description of the slider caption?
Thanks
ThemeArile