Prepare squash by cutting in half width or lengthwise. (Can also leave whole.) Scoop out and discard seeds.
Place trivet in Instant Pot and pour in 1 cup of water. Place squash on top of trivet.
Place pressure valve to sealing. Pressure cook for 8 minutes for cut squash and 12 minutes for whole squash. (***It will take about 10 minutes to come to pressure.)
Once time goes off, carefully place pressure release valve to venting. Remove squash and use a fork to scrape out the strands.