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You can have both print and submit button on your form. Inside of this guide you can find out how to add a print button to your form: http://www.jotform.com/help/24-Print-Button-on-Forms
However they will be two separate buttons. It is not possible to have one button that will be print and submit button.
If you want that only Print button is shown on your form than you would need to Inject Custom CSS to hide submit button. Inside of your Form Builder select Setup & Embed tab, then click on Preferences, then select Form Styles tab and inside of Inject Custom CSS field at the bottom of existing code paste this code:
Here is my demo form where I used mentioned CSS code to hide submit button:
Please note that your users will only be able to print your form.
Hope this will help. Let us know if you need further assistance.
Considering that your last question is not related to subject of this thread, I have moved your question to separate thread and we will provide you an answer there shortly.