How to secretly add a page address to a form?

Hello, please help.

I want to receive the URL of the page from which the user submitted the form. I need this to see the UTM tags stored in the link.

I tried to implement this instruction but failed because I don’t quite understand where and how to integrate it.

Do you mean you want to access the query parameters of the current page that the user is on? You can do this with: queryParams - Velo API Reference - Wix.com or query - Velo API Reference - Wix.com