How to activate keyboard backlight?

[KindaHardcoreGamer]

I have a Steelseries Apex 300. The webpage says it comes with a backlight, but I don't know how to turn it on. How do I do this?
Thanks

 

[Rick Kraster]

you should be able to control it with the software

 

[KindaHardcoreGamer]

you should be able to control it with the software

What software? (Sorry I'm new to this)