Populate a wordpress page from a form

Is it possible to use a form to populate the content on a wordpress page ?

Afraid not. You can only add your form to WordPress:

Adding-Forms-to-Wordpress-org-Version

How-to-Embed-a-Form-to-Wordpress-com

May I suggest you contact WordPress support and talk to them about how to accomplish updating your page.

https://en.support.wordpress.com/contact/