To change a node's name with the keyboard:
(1) Make sure that the tree has focus so that receives your keyboard commands. If the tree does not have focus, just click on it so that it becomes active.
(2) If the node is not selected, use the Up/Down Arrow keys on your keyboard to select the node.
(3) Press F2.
(4) The node's name becomes an edit box.
(5) Type in a new name or edit the existing node title.
(6) Press "Enter" on your keyboard to apply the changes, or "Esc" to cancel the changes.