Apply any orange preview layers and active selection/path to a new Curves adustment layer. If you are not familiar with curves, please see this tutorial on Curves vs Levels (and why I prefer Curves).
Brightening shadows through a luminosity mask can be a little counter-intuitive. Lumenzia adds an anchor at the far left of any curve applied with a dark mask, which makes it quick and easy to brighten the shadows. (please see demo video below).