I want to know how to link the member registration form with a database without repeating the same email or any field

I created a merchant registration form, a first page and two windows, but the windows can be exited before completing the registration, and with this the data that he registered on the first page is recorded in the database. I want the windows not to be able to exit except after completing the registration, and I want the registration to be in the same merchant field, not every window or page in a field. Can someone help me without a code?

If you want to keep users from exiting early, the best way is to use Lightboxes instead of popups and turn off the close options. That way, they have to complete the process before moving on. To keep everything under one merchant entry, don’t submit data after each step—just hold onto it in hidden fields or session storage and send it all at the end. A multi-step form in Wix Forms is a great way to do this since it keeps everything in one place. And to make sure nothing gets submitted halfway through, just enable form validation so they can’t move forward unless everything’s filled out.