To the inner pot of your Instant Pot, add the whole milk. Set the Instant Pot to the Yogurt Setting and set the Temperature to 'High.' Seal the lid, start the mode, and the Instant Pot digital readout will say 'BOIL'.  Wait for Instant Pot to finish boiling the milk. Remove the lid, and insert the digital thermometer into the milk to ensure it is heated to 180 degrees Fahrenheit.

Remove the inner pot from the Instant Pot, and allow it to cool on a heatproof surface. Allow the milk to cool to 115 degrees Fahrenheit. Place the inner pot back into the Instant Pot, and close lid. Set the dial to Yogurt, and select the low heat mode. This will incubate the yogurt at a low warm temperature. Allow the yogurt to incubate for 6 to 8 hours, or until the yogurt sets, and becomes more solidified.

Refrigerate the set yogurt for 4 hours to allow the yogurt to thicken.

If you like thinner yogurt, you can enjoy the yogurt right away. For thicker yogurt, or Greek-style yogurt: line a strain with cheese cloth. Place the strainer in a bowl. Add the yogurt on top of the cheese cloth and allow to strain for 4 more hours.