In a 6-quart instant pot, combine the rice, ham bone, water and ginger. Lock the lid in place and set the valve to sealing position.
Press the Porridge setting. After 10 seconds, the pot will beep 3 times and the LCD will display On to indicate that the pot has entered the preheating cycle.
For this recipe, it will take about 10 minutes to preheat the pot. During this time, the pot will heat up and pressure will build up and the float valve will rise. The LCD will then display 20 minutes, time for porridge to cook.
When the cooking cycle has finished, the pot will switch to the Keep Warm mode. Allow the pot to cool down naturally until the float valve drops down. This will take about 1 hour.
Set the valve to venting position, make sure the float valve has risen and then open the lid. Remove the ham bone and pull off meat from the bone. Return the meat to the soup and discard the bone. Stir the congee and then season with salt to taste. Press Cancel and then unplug the instant pot.
Ladle the congee into bowls, garnish with chopped green onions and serve.