To add/edit/delete nodes, use context menu in chart.

1. Root Items: Right-click blank area on the chart and select Add root items.

Optionally you can select the number of nodes.

(Figure 1 : Charting)

2. Type in the Content  box

(Figure 2 : Charting)

3. Child Items: Right-click on the node and select Add Children.

To edit/delete the node, select that action from the menu.

(Figure 3 : Charting)