how do I get text to line up under two side-by-side photos?

I've inspected your form, but I was unable to see where are the photos located?

You should be able to do this by positioning the fields as explained here: https://www.jotform.com/help/328-How-to-Position-Fields-in-JotForm.

If you need further assistance, please let us know exactly where do you want to place the photos and the text so we can help you out more accurately.