Yogurt button makes life so easy, but just in case you don't have Yogurt button on your pot, you can still make yogurt. Unfortunately, Cold start method doesn't work with no yogurt button. So, boil your milk in Sauté mode(normal) to 185F, turn it OFF and then cool it down to 110F. Add the starter yogurt and whisk it thoroughly. Close the lid, unplug the Instant pot and Wrap the whole Instant pot(Its still turned OFF) in a towel and keep in warm place for 8-10 hours.