Add milk to your instant pot and press the yogurt button until the screen reads "boil"
Making sure your instant pot is sealed and the pressure valve is closed, boil the milk, ocassionally checking the temperature with an instant read thermometer.
You might need to do two rounds on the boil setting before the milk is hot enough.
Once the temperature reads 190 degrees F, turn off the instant pot.
Use hot hands to remove the stainless bowl of the instant pot with the hot milk in it.
Place the container on a cooling rack (I just use one meant for cookies).
Cover and cool to 110 degrees F.
Add 1 TBSP yogurt starter once the mixture is cool enough.
Stir with a whisk to combine everything.
Carefully place the bowl back in the instant pot body and press the "yogurt button".
Tap this botton until it shows a timer. When you see the timer appear on the screen, use the + and - buttons to toggle the timer. I like to start with 10 hours and then see how thick the yogurt is.
Once the timer is up, check on your yogurt. It should be quite thick, but still creamy and pourable. If it's not thick enough, add a few more hours to the yogurt timer and check again.
Once the yogurt is done, strain using cheese cloth or nut milk bags, following my notes above.
The liquid strained is called whey and can be used for all kinds of lacto-fermentation in the kitchen.