How do I activate the auto start-stop feature in my Audi A4?

I am trying to conserve fuel while driving my Audi A4 and was told that the auto start-stop feature can help with that. However, I am not sure how to activate it. Can someone please guide me through the process?

To activate the auto start-stop feature in your Audi A4, simply press the button with the letter 'A' and an arrow in a clockwise direction. This will activate the feature and it will automatically shut off your engine when your vehicle comes to a complete stop. Once you release the brake pedal, the engine will start again. Keep in mind that this feature can also be deactivated by pressing the button again.

Firstly, make sure your vehicle is in 'Drive' mode and not 'Sport' mode. Then, press and hold the 'A' button for about 2 seconds until a message appears on your dashboard confirming the activation of the auto start-stop feature. You can also find the option to activate or deactivate this feature in your vehicle settings menu under 'Efficiency'.