To apply color adjustments using the Polygonal Lasso:

1. Adjust the color settings on the left panel.

2. Click on the image to set the starting point.

3. Move the mouse to draw the first line segment and click to set its end point.

4. Repeat to create additional segments.

5. Double-click to complete the polygon.

To apply different color adjustments to another part of the image, click on New Selection.