Plug your Instant Pot in and push the "Sauté" button. The reading on the front will just say "On," and the bottom of the pot will get hot to sauté.
Melt the butter in the Instant Pot. Once melted, add the onion, carrot, celery, and a big pinch of salt to bring out their juices. Saute the veggies for about 5 minutes or until the onions go translucent.
Add the garlic, thyme, oregano, and basil. Cook for 1 minute.
Add the broth, chicken, and noodles, and turn off the Instant Pot so the sauté mode turns off. Put the lid on your Instant Pot, turn the vent valve to closed, and push the "Soup" button. Use the manual buttons (the +/- buttons) to bring the time down to 4 minutes. It will turn on automatically after a few seconds.
The Instant Pot will take about 10 minutes to come to pressure, and then it will count down the 4 minutes. When the 4 minutes is done, quick release your valve (use a towel or oven mitt to turn the valve). It will take 1-2 minutes to release all of the pressure.
After the pressure releases, take the lid off, and more salt and pepper (to your taste). Serve warm with toasty bread or crackers! (I served mine with GF cheese rolls from Costco)