How to add print button to my jotform?

and how do I put the print button

To add a Print option on your jotform please follow the steps in the following guide: How to add print button on forms.

Do let us know however if you happen to have any questions in regards to this and we would be happy to assist.

I know this, but I want to put a print button to thanks

Unfortunately that would not be possible.

You can only have the print button on the form, not on the thank you page itself.

You could only give them instructions on how to print the thank you page, or if preferred, you can redirect your users to a page on your own website and add the option for printing that page manually.