And how do I link the form to something like a Facebook ad?

And how do I link the form to something like a Facebook ad?
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Hi there - Unfortunately, it isn't possible to add your forms to Facebook ads. You may want to consider adding your form to your Facebook page instead.

Guide: Adding-a-Contact-Form-to-Your-Facebook-Page

Let us know if you need further assistance.

And if you are tracking your Ad's success, consider using Facebook pixel. This is a brand new Widget which you can easily add on your form. Please try it out and let us know:

https://www.jotform.com/widgets/facebook-pixel