You can shred chicken any number of ways but one of the fastest ways is with an electric mixer and two beater attachments. This will shred the meat almost instantly and really helps to cut down on time but I do not recommend doing it inside of your Instant Pot liner as it can scratch it up. Another great way is a pretty standard and traditional way of simply using two dining forks. Poke the meat with both forks and pull away, dragging the forks over the meat of the chicken. It should shred easily as you go.