Hi,

Sorry about the lack of documentation. I've hardly any time for writing documentation and frankly I don't enjoy writing documentation.

The $_REQUEST value of a element is something that can be pulled from the URL.
So setup your element so that $_REQUEST value is "test".
The URL to the page with the Formidable form is for example:http://my-test-url.com/form
If you create an url like this:http://my-test-url.com/form?test=my-value,... the form element will have "my-value" already filled in.

Hope this helps.
If you have any other questions, please feel free to ask!

Best,

Corretje

Thanks for help. I understand now.
But Concrete5 is not showing any of that things in address bar.
Even if I want to use it, I can't take it from anything...

Concrete doesn't do it for you. You need to create that address manually....
Just create a link to the form and add that value to the link.