In your scene, -click and move the mouse to the left or right. By moving the mouse, you interactively change the value of the selected channel.
As you move the mouse, note that pressing the key gives you finer control, and pressing the key gives you less control.
Do one of the following:
Click Select to select the node you are now editing as the currently selected object in your scene.
Click Load Attributes to load the attribute values of the currently selected node.
Click Copy Tab to open a separate window containing the attributes for the selected node.