How can I add the option for my users to print the form before they submit?

You can add a Print button to your form. To do that, please follow this guide: https://www.jotform.com/help/24-Print-Button-on-Forms

For the JotForm Cards, unfortunately, the Print button cannot be added at the moment. Please use the Browser print page, here's a guide: https://www.wikihow.com/Print-Web-Pages-with-Chrome

You can also enable the Review Before Submit feature to your form in the Form Settings page.