Exit button

Hellow

how can i add a button to exit without saving?

You simply have to close the browser or the page if you want to exit from the form.

However, if you want a close button to close the form then you will have to embed your form using the lightbox embed code. Lightbox embed code opens the form in a lightbox with a close button. 

Guide: https://www.jotform.com/help/220-How-to-Create-a-Lightbox-Form

Demo:  https://shots.jotform.com/elton/jotform_lightbox_demo.html