Add more field

Hi there

I have read out your threads for how can i add a custom field for phone in the plugin popup. But as you said we can customize the code . but how can i customize direct code because if you provide any update in future than definitely my changes will be vanished?Let me know please as i need to add a phone field on a website.

Thanks,waiting for your response.

https://www.ads-software.com/plugins/beauty-contact-popup-form/