What does it mean when it says "replace what's here with the ones in your original script" ?

The set is called "Primeval Predator".


What does it mean when it says "replace what's here with the ones in your original script" ?This infused bloodseeker set i'm trying to install works, but the infused part isn't working. I have a notepad titled "replace what's here with the ones in your original script". What do I do with it?