Let users modify a dynamic page

Hello everyone,
I have a form on my website connected to a database: when people submit the form, the informations they sent populate a database, which is displayed on a dynamic page, showing all the informations they inputted in.

What I’d like to do is let users edit this page, by filling up and submitting another form with the same input fields (without mandatory fields, so they can modify specific fields).

Another thing: the form for now can be compiled without registration, but I’d like to convert both the forms to registered members only, so that the dynamic page they populated is associated with their account and nobody else can modify it.

How could I achieve this goal?
Thank you in advance! :slight_smile: