Returning Customers

New to AppSheets and becoming more literate while working.
My app is a form customers must complete before service.
Many are returning customers.
How can I set the app to recognize a potential returning customer and get to a point of automatically populating the rest of the customers information?
Since I’m new to all this, I could really use a video or a link to step-by-step directions on this one.
Thanks all!!

Welcome to AppSheet @Michelle_Cameron! We’ve put together a great list of resources to help you learn how to use the platform that includes videos, a free one-hour class and more.

For form specific information, please view this article on what’s called the UX View Type. It includes a quick walk through on working with forms and additional resources.