Thanks for reaching out to us! There are a couple of ways to achieve this:
– You can use the Pro tab > Dodging tool to lighten areas. Adjust the dropdown between Shadows, Midtones and Highlights depending on what you want to lighten. You can also paint over your image a number of times
– You can also use the Pro tab > Pro Adjust tool to increase Exposure or Highlights, click Reverse Effect at the bottom of the Effect Painting dialog that appears and then paint on the areas you want to adjust.