When you get into the car, the hazard warning lights button in the overhead console lights up, showing that you can use it. There's also a button located in the bottom bar in the display.
Press the hazard warning lights button, either in the overhead console or the display.
Both of the direction indicator symbols in the driver information area of the display and the hazard warning lights buttons flash simultaneously in the same rhythm as the lights. You will also hear a ticking sound.