Hello,
1) Please watch this video – https://youtu.be/LgzC4iK-j6A
2) About the popup, enable Elementor for static blocks – https://prnt.sc/vu9pka , create a static block with the desired content – https://prnt.sc/vu9q21 , then go to Header builder > add Newsletter element into the header content and select your static block – https://prnt.sc/vu9r6s
Regards















