I've downloaded a 2 week demo of SC and trying to figure this beast out.

So first question is why am I not able to select renko bars? The option is greyed out.

Also, how do I enable volume or tick bars? Not the volume bars that go fatter or thinner...just a simple volume candle.

Thanks!

You can't apply Chart draw type renko on time based chart.
Push key F5 and choose Renko bar from Bar Period Type.