For creating a node, first choose the desired node type from the node tiles. Click button-1 in the background of the drawing area, at the desired position. A new node shape appears, having its center at the position where is clicked and having the shape as indicated by the selected node type in the tiles. The node shape is surrounded by a set of selection handles which are black or grey rectangles, showing that the shape is selected. Selection handles of a node shape are also used for resizing the node.