To cook the chicken in the instant pot, add 1 cup water to instant pot. Add the trivet that came with your instant pot. Add chicken breasts. Lock lid; set valve to sealing. Program for manual-high, and 22 minutes. When cook time ends, carefully move valve to venting to release steam. Remove chicken and shred with two forks or place chicken in the bowl of a stand mixer. Fit mixer with mixing paddle and turn to speed 1. When chicken is shredded, turn mixer off. (About 30 seconds-1 minute.)