You can add the wire rack that comes with the Instant Pot. However, I prefer to just put the chicken straight into the liquids at the bottom. This will make the chicken fall apart more easily; however, I really like that. If you want a more 'firm' chicken, use the wire rack.
Pour the broth at the bottom of the Instant Pot. Add the chicken on top and sprinkle on the seasonings.
Cover the pot and secure the lid. Make sure the valve is set to sealing. Set the pressure cook button to 13 minutes and start it. If the chicken is stuck together, add an extra 2 minutes. However, please note that cooking times can vary widely depending on the side and thickness of your chicken breast.
Once completely cooked, let set for 1 minute, then vent and de-pressurize the instant pot then open the lid.