This tutorial will be based on ninzarenko bar types. Once you install free NinzaRenko, or from the link below, make sure you unpack it first.
Open NinjaTrader
Cick New -> Chart -> select MNQ -> select type -> select NinzaRenko

Then select brick size 20 and treshold 10

Now enable chart trader from top menu

Make sure your ATM strategy looks like this

Download, install and add BounceTrader indicator