Place the broccoli in the insert. Close the lid and set the Instant pot to high pressure and the cooking time to 0 minutes. The pressure and heat from the Instant Pot coming up to pressure is enough to cook the broccoli to perfection.
You can use frozen broccoli instead of fresh broccoli. The time and pressure would be the same. Make sure to use a steamer basket as you don't want any of the broccoli falling through into the Instant Pot.