I need to auto-populate the hidden fields in Forminator.

I need to auto-populate the hidden fields in a form created with Forminator. I tried the solutions from the following thread, but nothing worked for me.

https://wpmudev.com/forums/topic/populate-utm-parameters-in-hidden-fields-forminator/

https://wpmudev.com/forums/topic/forminator-fill-in-fields-from-url/

Can you please help me with this?