How to display custom error message when required fields are not filled out?

What’s up, everyone!

On one of my client sites, I use the custom checkboxes and dropdowns from Finsweet on the contact form.

This being said, if the user tries to submit the form without filling out these fields (each is required), no error message displays to let the user know which required fields need to be filled out (if the missing fields are the custom dropdowns or checkboxes).

Does anyone know how I would be able to display a custom error message when these fields are left blank?

Here is the share link.

I would be very grateful for any help!

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