I would like to ask the function button behind the photographic lamp for an expert's answer.

You only need to know a few main ones.

On the upper left, the buzzer, that is, it will beep after flashing.

In the middle, the flash index is adjusted up and down,

The green lightning on the right is the flash test key, that is, you press it to see if the flash works normally, or metering is to use it to flash.

The three on the right and the two on the lower left should adjust the brightness of the modeling lights. You can try this. All kinds of lights are different. Click it to see if the modeling light is on or off when you press a key. That's how it is used. Just press it. It won't break.