How do you introduce koi carp to your pond?

Place the container the fish is in in the pond and using a thermometer allow the temperatures to equalise. Failing that, have the fish in a bucket half filled with their original water and add 1 cupfull of water from the pond into the bucket each 5-10 minutes. Once things have equalised lower the bucket of fish into the pond gently and once the bucket is submerged tip it so the fish will swim out.