The method of operating the Supor rice cooker's porridge cooking function is as follows:

1. Plug in the power supply: First, plug in the Supor rice cooker and make sure the power light is on.

2. Set the cooking mode: Press the "Porridge" button on the rice cooker and select the cooking mode as porridge.

3. Set the reservation timer: Find the reservation button on the rice cooker, which is usually a clock or time icon. Press this button and the rice cooker will enter the scheduled timer mode. Adjust to your desired time by pressing the hour and minute keys. For example, if you want to have a delicious breakfast at 7 o'clock the next morning, then you can set the reservation time to 7:00.

4. Start appointment timing: After completing the above settings, press the start button to start appointment timing. At this time, the rice cooker will start working according to the time and cooking mode you set. When the predetermined time arrives, the rice cooker will automatically start cooking.

5. Wait for cooking to complete: After the predetermined time arrives, the rice cooker will automatically start cooking. You just need to be patient and wait for some time for the rice cooker to complete the cooking process.

6. Enjoy your food: When the food is cooked, the rice cooker will automatically keep warm or stop working. At this point, you can open the lid of the rice cooker and take out the food to enjoy.