Here's how to adjust a parameter using the Actions Ring:

1. Open the Actions Ring by pressing the "Forward button" (or your customized trigger if you've previously changed it).
2. Once the Actions Ring is open, move your mouse cursor over a desired bubble (ex: brightness).
3. Use the thumbwheel or the scroll wheel of the mouse to adjust the parameter of that bubble.
4. Alternatively, you can click on the desired action bubble and drag it to the right. As you do this, you'll see an adjustment bar. By dragging the cursor to the right or left, you can change the parameter associated with the selected action.