I placed support and resistance lines based on rejections and bounces. Look at how they matched up to the volume profile. I just started reading on Renko charts today, but to put it simple:
Renko does not chart out every single unit of time hence why you dont see much squares on the chart despite being a daily chart; it is more reliant on price movement. A new square will develop if there is significant price movement, this makes it easier to track the actual movement/sentiment of the price. Im still experimenting but i found it great since it clears out alot of noise; a very good attribute to have in this market.