From the Tools toolbar, select
the Pen tool 
.
From the Tool Options palette,
select Edit Mode 
.
Click a vector object. The object's nodes appear.
Do any of the following:
To select one node, click the node.
To deselect a selected node, hold down Shift and click the node.
To select multiple nodes, hold down Shift and click each node. Or, drag a selection box over the nodes.
To select all nodes on a contour, double-click one node. If the object has only one contour, this selects all nodes in the path.
To select all nodes in a path (all nodes in the object), press Ctrl + A or right-click and choose Edit > Select All from the context menu.
To select the next or previous node on a contour, hold down Shift and press an arrow key.