Well, the script themselves are simply Plz accounts.
Which, as I'm sure you know, are just regular DeviantART accounts with Plz at the end to indicate that they are meant to be used for decoration on DeviantART.
As for the script, you just take the Plz account name that you want to use and put it between ":icon" and ":".
So, this Plz account's script would be :iconParentalAdvisory2Plz
:. Because it's DeviantART account name is ParentalAdvisory2Plz.
To make the script come up without using spaces or showing the picture, I use the acronym HTML code. Like this:
Is that what you were asking about?
If not, let me know and I'll try to help you the best I can.