Don't know how to make the screen brighter (iOS)

Another way to increase the brightness level is via the quick access menu (control center).

To access it, swipe a finger up from the bottom of the screen and the iOS quick access menu will appear. Move the brightness slider to the left to dim the display.

Note: This feature is only available to iOS devices that run iOS 7 or later. Make sure that Control Center is available within applications and on the lock screen too. To check this, go to Settings -> Control Center.

Siri is the virtual assistant which helps you perform various tasks such as sending a message, increasing and decreasing the display brightness, etc. Before you start using it you need to make sure that it's activated.

To activate Siri:

1. Go to Settings -> General -> Siri -> Move the slider to the right to activate Siri
   
   * If you don't want to press the home button to activate Siri, you can also activate the Allow "Hey Siri" option (Siri will appear once you say "Hey Siri"), which is available only to iOS devices which run iOS 8 and later, and which is plugged in a charger.
   
   

             
   
   

Follow the steps below to learn how to use it:

1. Press and hold the Home button
   
   

   

2. You will hear two quick beeps to tell you that Siri has woken up and is waiting for you to speak (What can I help you with?)
   
   

   

   
   
   
3. Ask Siri to perform a task such as emailing or texting or in this case, increasing of the level of brightness of the display
   (e.g. Increase brightness, Brighten up screen please)
   
   
   
4. Siri will automatically detect when you have stopped speaking, but you can optionally press the microphone icon to show you have finished speaking

Go to Settings -> Display & Brightness -> Drag the slider to the right to brighten the dispay

Note: You can also enable the Auto-Brightness feature (by moving the slider next to it). The brightness will be adjusted automatically according to the current lighting conditions, thanks to the Ambient Light Sensor.

Also, Night Shift is another feature, which will dim the screen automatically after sunset.