I use drip acclimation for all my fish, shrimp, and crabs other than hermits. You'll need a bucket or styrofoam container that should hold at least three time the volume of water the fish was shipped in and some air line.
Float the bag in the aquarium water with lights out for 15-20 minutes, then open the bag and place the fish and the shipping water into your container. (Keep the lights out for the remainder of the procedure.). Tie a couple of loose knots in the air line and start a siphon from the tank to the container. Tighten the knots so the flow reduces to just drops. The drops should be steady, but distinguishable as drops rather than a stream of water. Let this continue for an hour and a half at least, and until the water volume has tripled. Net the fish and place it in the aquarium. Discard the water in the container.
It is a violation of federal law to use this product in a manner inconsistent with its labelling.