How do I turn on the Traction Control system

I was making a left hand turn and all of a sudden my rear end kicked out to the right and I did a nice little fishtail. The road conditions were damp, but not drenched and I did not accelerate fast or turn the wheel sharp, I was driving normal. My TCS does not have a light, it either says off or says nothing. Now, here is where I'm confused, I was told that when TCS is activated it illuminates as saying off, and when it's not lit up saying off, then it's not engaged. I have been told that and vice versa though. So, what should it say if it's engaged and active.

Thanks,
Pete