Unhook, race downwind and lean forward.
Bend the knees and pressure the inside rail. In essence you are charging into a turn like a normal jibe. However, there is a slight difference in that you are putting some pressure down into the mast with your front hand. This will create a load point for your jump.
As you reach dead downwind, or even just a bit before, you want to get the board to pop out of the water by sheeting in with the front hand and extending the clew hand really hard and springing off your back foot.
Now leap out of the water and throw you head over your shoulder while keeping your body somewhat vertical. Be sure to get a good spring out of the water by really bending your knees in the carve and throwing an extended back arm out and over your head. If you do not sheet out then you will go into a really mushy and wacko forward loop with the mast digging into the water.
Remember to throw the clew up over your head and fling your head in the direction you want to go. As in most sport maneuvers, your body follows your head.
Pull your knees to your chest and then lean back against the pull of the sail so your body goes horizontal but above the water.
Let the board rotate around and sheet in.
Splash! If the sail goes in the water then no bother because very few people make this move dry. Try to land with the sail high above your head and your body tucked into a ball.
Push the sail up to get power back in the sail by extending your arms and keeping the sail clear of the water. Hopefully, there will have been enough rotational force to pop you out.