Most tools use sliders for changing values and applying adjustments. Wherever a slider is employed, a value field is also displayed. This can also be used to alter adjustments.
Click and drag the slider to the left or right to set a value. Drag the slider to the right to increase the value or effect, drag the slider to the left to lower the value. Alternatively, you can place the mouse cursor over a slider and use the scroll wheel function to fine-tune the settings. As you can concentrate on the image itself, this is a good method to make adjustments without referring back to the tool.
As some sliders are centered, dragging a slider to the left usually applies a negative value. Note that sliders have various value ranges, which depends on the parameter.
Click inside the value field and type the desired number.
Changing values in small increments
Click inside the value field and use the page up/down arrows on the keyboard to alter the number by a small increment, typically 1 or 0.1, depending on the parameter.
Changing values in large increments
Click inside the value field, then click and hold the Shift key and use the page up/down arrows on the keyboard to alter the number by a larger increment. This is typically 10, though it can be 1, depending on the parameter.