Hello Glen,

To style caption links which are being added below the photo, you should navigate to Appearance > Customize > Additional CSS and add code below (this is just for making links underlined, you can also manipulate the size of the links and other values):

.post-box-detail p.caption a {
text-decoration: underline;
}

Please let me know if you need something else. I’d love to offer further help.

Thanks,
Piotrek