Add your milk to the Instant Pot. I usually make 1.5-2 gallons at a time, but you can make however much you'd like.
Next, hit the yogurt button on your Instant Pot three times. That will turn on the boil function so your milk can heat up. Your cultures like a warm environment so we won't add them yet.
Use your thermometer to check the temperature of your milk. When it heats to around 120 F, go ahead and add your culture: if using ABY2C, go ahead and sprinkle 1/8 teaspoon on top of your milk or if using cultured yogurt from the store, add 2 tablespoons per gallon of milk.
Use a whisk to stir it around, up and down until you're sure everything is incorporated.
Hit the "cancel" button on your Instant Pot and hit the "Yogurt" button again, this time twice. I like to stay on the "Less" setting so as to ferment at a lower temperature. If this doesn't matter to you, you can do a normal setting.
You'll have to decide how long you want your yogurt to ferment for. I usually start this process before I go to bed and wake up the next morning to finish it. The rule of thumb is, the longer you ferment the tangier it is.
I like a more mild and sweet flavor to my yogurt so I usually stick with about 12 hours.
After your yogurt is done, stick your Instant Pot into the fridge for 4-6 hours to allow your yogurt to firm up some.
After your yogurt has set in the fridge for several hours, check the consistency of it. If it's to your liking, transfer your yogurt over to air-tight containers.
If it's not thick enough, lay your cheese cloth over your mesh strainer and lay inside a large bowl. Pour your yogurt into the cheese cloth (you may need a spoon to loosen it and get it all out) and gather up the sides of the cheese cloth to tie onto something and hang so that the excess whey drains out.
You can strain your yogurt to the desired thickness for up to 4 hours, but I would check it at that point. I've strained my yogurt whey (punny) too much in the past and regretted it more than once!
Once desired thickness is reached, you are done!
Enjoy with maple syrup, fresh berries and granola or even strawberry jelly!