How can I set up a form to require multiple signatures prior to submittal?

I am a marriage coach, and my client agreement form requires signature from both the husband and the wife.  How can I set this up so that the option to submit the form only appears once both signatures (and all other required fields) have been filled in?

Greetings,

You can add two signature fields to your form with different desired names and make both of them required from their properties:

In this way, user's want be able to submit form unless these fields are not filled. However, if you want to disable Submit button, till signature fields are empty, you can use show/hide Conditional Logic:

If any of those signature fields is empty, hide a submit button:

Please check my demo form below:

https://form.jotform.com/201696947488071

Please give a try and let us know if you will have any further questions.

Thank you!