How to apply expressions in the green room

Question: How to apply expressions in the green room?

Answer:

In the Green Room, click [Use Expression Editor]
The Expression Editor dialog opens to the quick set page. To the right is an expression dial. Each wedge-shaped section of the dial is labeled with the name of a particular expression; to implement that expression, click somewhere inside the pie slice. The farther out you click, the more extreme the expression. You can also Click and drag in and around the dial to set the intensity of the expression dynamically as you move the mouse.
When you're happy, click [Apply] to implement the new expression