Change homepage caption sliders

Hello,

I am hoping someone can help me with the following…

On the homepage of my library’s blog (archiveblog.jfklibrary.org) I would like to change the caption sliders for each image from the current ones (excerpt and “continue reading”) to just one slider that shows the date of each post.

I believe the relevant code is found on the functions.php page within the <figcaption> tags, however I dare not change the coding there!

Can someone tell me how to make this particular change?

Thanks so much!