Greasy Fork is available in English.
a script to easily store as many skins as you want
< Opinie na Skin Storage Script
Seems the script wasn't activated somehow. What browser are you on? And can you press F12 while in Jstris and with the Skin Storage Script turned on? And go to the Console tab. Do you see any messages there? What does it say?
nothings showing up
i put it in tamper monkey and i went to jstris i looked but no green plus was there