Set the Instant Pot to Sauté.
Add the curry paste to the Instant Pot bowl with a tiny amount of oil.
You want to cook out the paste to bring out the flavor - then add the lemongrass (after crushing it) and bruise the kaffir lime leaves as you add them. (If you do not have these just leave them out)
Then add all the other ingredients - except the potatoes and the chicken.
Stir this well so it is evenly mixed.
Into you wet mix - now add the potato and chicken and stir gently but well so that the wet mix goes all over them.
Now you are ready to cook.
Set the Instant Pot to high pressure for 15 minutes, and let it naturally release the pressure for 10 mins after the timer has beeped.