Default Installed Null, now Double tap of screen does nothing

I cannot access anything from double tapping the screen now that I installed the new Null Rom. I want to be able to get to the standard Note 3 settings for Volume and Brightness, as I shut down the volume while sleeping to avoid hearing incoming notifications, and to adjust screen inside or outside. Any settings in Nova or other that may have caused this, and how do I get this feature back? Thank you.