Welcome to TRT... there are various ways to do it..
The way I do mine is, float the bag for 20 minutes to get the water temp right in the bag... Then open the bag and put 1/2 cup saltwter from you tank in the bag and wait 5 minutes, then put another 1/2 cup and wait five minutes, do this until the bag is full, then empty about half of the water out, refill the bag using same method as above and empty, refill the bag once more using same method as above then remove coral and place where you want it.. Don't empty any bag water in tank...
This is the way I do it, others do it other ways...
