How to turn on the flash of mobile phone camera?

Take vivo xplay3s mobile phone as an example, the method of setting camera flash is as follows:

First, find the "camera" icon on the desktop of vivo xplay3s mobile phone, and then click Enter.

2. After entering the camera interface, find the lightning symbol in the red box at the top of the page below, and then click Enter.

Third, after entering, find the opened items in the red box below and light them up, so as to turn on the flash of the mobile phone camera.