Can't locate existing script to edit

Can't locate existing script to edit

I want to edit an existing script (Email notification – Edit – On Success) but I can't find the existing script!
I get to here  https://creator.zoho.com/gstann/form/1/scriptbuilder/#
but it's just the generic stuff not the actual current script which I'm trying to get the Part # to show in.
Please help.
Thanks,
Geoff