The Grill Function (without preheat) is specifically designed for air frying and quick baking. You can place ingredients directly into the oven to start cooking immediately. The operating steps are as follow: In standby status, press the GRILL Key 2 times to enter Grill Function (without preheat). Turn the knob to adjust temperature, then press START/CONFIRM key or SELECT key to enter Timer setting. After setting the cooking time, press the START/CONFIRM key to start cooking right away.