how can I print a form

There are many ways one can print form. Do you want user to print what they have filled in the form? if so then you can add print button to your form. this will allow users to print the form they are filling.

https://www.jotform.com/help/24-Print-Button-on-Forms

If you meant you want to print form submissions then again there are different ways of doing so. You can setup the form to send PDF attachment of submissions made an you can print this document of you can use the submissions menu from there yo can print the submissions.

Below is a guide showing how this can be achieved.

https://www.jotform.com/help/335-How-to-Print-the-Form-with-the-Users-Data