How do I turn on Acer backlight for keyboard?

Acer Aspire 3 A315-31-C588
My backlight has never been on for my Acer laptop, im wondering if this model does not have a backlight function, or what but i cant find anything online for this model. ive tried Fn+F9 already and that does nothing. its really hard to use my laptop in the dark because i cant see the keyboard at all. someone please help and let me know if theres a way i can turn the backlight on or does my laptop not even have a backlight? thanks