To begin, navigate to the Toolbar > Edit with Elementor > Schedule a Call Popup:
Or go to Templates > Popups > Schedule a Call Popup > Edit with Elementor. You can edit the layout, conditions, rules, and styles of the popup.
Please check these guides for further information:
Read more about the Elementor Popups
Guide to Vamtam Elementor Builder
How to trigger the popup from the button?
Click on the "Edit" icon of the button. You can edit or remove the popup connection in the Link field:
Please follow the detailed tutorial for how to "Create a Button to Trigger an Onclick Popup in Elementor" here:
https://www.youtube.com/watch?v=-29XXbJLnQM
https://elementor.com/help/how-to-trigger-a-popup-on-a-link-click/