Node Selection And Move

To select a node.

Steps:

      1.To select one node: click the node, drag the mouse to form a box around the node.

      2.To select several nodes: drag the mouse to form a box around the nodes, or click the nodes one after another by pressing the Shift key.

To move a node

Steps:

     1.Select the node

      2.Hold and drag the left button to move the node. (A node can be moved horizontally or vertically by pressing the Ctrl key at  the same time.