Pour milk into the Instant Pot inner pot
Press the Yogurt button
Select Boil
Heat the milk to 180°F to 185°F
Remove the inner pot and let the milk cool to 110°F to 115°F
Whisk in 2 to 3 tablespoons of plain yogurt with live active cultures
Return the inner pot to the Instant Pot
Press the Yogurt button
Set the incubation time to 8 to 12 hours
Let the yogurt culture undisturbed
Check the yogurt for thickness and tanginess
Refrigerate the yogurt for at least 4 hours
Stir before serving
Save a small amount as starter for the next batch