When you "+Add" a new script, you have to first change the "Authentication Type" to "Advanced (Script)":
This will alter the interface somewhat and give you the "Designer" tab, which is where you program the script (note: the Blueprint scripting language utilizes the full capabilities of C#, with the exception that it does not support user interfaces). I suspect that there is no "meat" in the script or that there is a syntax/development issue. I have attached a baseline "custom" script that works (generally) pretty well out of the box. It is fairly-well documented, but still does require some C++/C# knowledge to make significant changes beyond those described in the comments. To begin, just copy and paste the text into the Designer tab.
I hope this helps get the customer where they need to be. Otherwise, Pharos Systems can assist with one as a Professional Services engagement. Please contact your reseller or Pharos Account Manager if you wish to go that route.
Thank you for detailed explanation.