Okay, here's the form in question...
https://www.lowercolumbiacap.org/cap-foundation/cap-foundation-donations/
What I want to do is make it so the 'Terms and Conditions' checkbox at the bottom must be checked in order for the submit button to be clicked.
In other words, I want to basically make the submit button un-clickable unless the agree box is checked. I've got Gravity Forms with a Developers License and it seems to me they'd have something as simple as this built in but I'm not finding it. Any ideas?