Help with Cloudbased Contact picker?

I'm new to the inventor. I have created an app where a user logs in. On opening the app, you can log in/sign up, but every time, the contacts list is empty. This is perfect for first-time users, but I want recurrent users to have their contacts saved. How can I do this?
(I used CloudDb for the log in screen; the images (:point_down:t2:) are the next page that does not currently have any cloudDB functions on it.)

Here is a TinyDB based contact DB sample ...

Thanks. I'll look into it now.