Thaw the meal overnight in the fridge if you froze it.
Pour the salsa and raw chicken mixture into the Instant Pot insert.
Close the lid, place the pressure release valve to seal, and set the Instant Pot to 12 minutes.
Quick release the pressure.
If your chicken breasts are quite large, you may need to put them back in for 2-3 minutes to get them to shred.
Shred the chicken in the salsa mixture.
Build your tacos!