If you require the script code to be present in all your funnel steps, use this method.
Paste the code inside “Body Tracking Code”
Don’t forget to save, you can find the “Save And Update Settings” in bottom of the page (need bit of scrolling)
If you prefer not to set up the script throughout your entire funnel, you can only make sure certain pages are collecting and populating fields. Do do that, go to page editor,
Go to “Tracking Code”
Paste the code in “Footer Code”
Close the popup and save the page.