Can't change backlit keyboard settings

I recently just got a Dell Inspiron 15 5558 initially set with Windows 8.1, now on Windows 10. I just started using the backlit keyboard and I was fed up with the 15-second setting on my keyboard. So I did some research. I know to change the timing it's in Windows Mobility, however it does not how Dell Customization. I dug deeper and found out that some users were using Dell Quickset Application. I don't have that either and couldn't find a file compatible with my laptop. Now what?

Thanks