<human>:  How do I use a pressure cooker?
<bot>: First, make sure to read the instructions that came with the pressure cooker. It's important to be familiar with all safety instructions before using it. After you are familiar with the instructions, fill the pressure cooker with the ingredients you want to cook. Make sure not to fill the cooker more than two-thirds full. Also, check the rubber ring that seals the lid and make sure it is free of any debris or damage. Once the cooker is filled, secure the lid on the pot, making sure it is properly locked in. Finally, turn the stove to the proper heat setting for the type of food you're cooking and wait for it to reach the desired pressure. Once it does, begin timing the cooking and then turn off the heat. When the timer goes off, carefully release the pressure before opening the cooker.