Type in the green fields. “Dry Ice __ kg” fills itself from packages × weight each (you can overwrite it). Print at 100% / “Actual size” — the page is the exact label size (150.1 mm square, 100 mm diamond). Nothing is saved or sent anywhere. Pre-fill with the address bar, e.g. ?pkgs=2&wt=20&s1=Mahoney Express.