Specific functions and usage can be Baidu, I am not professional.
If the economy does not allow, you can go to the drugstore to buy it yourself. Ordinary insulin is cheap in China, as long as it costs 40 yuan to get to 50 yuan.
But if you want to inject yourself, you must first ask the doctor to adjust the injection amount in the hospital. You can't shoot as many as you want. If you inject too much, it will cause hypoglycemia.
It is recommended to put a piece of sugar in your pocket when you inject insulin, and eat a piece of sugar in case of dizziness (hypoglycemia). Find a doctor and nurse in time in the hospital.