Help - Inserting nodes
You can insert a new node to a document by selecting New node from the edit menu or using the keyboard shortcut Ctrl + Shift + N. TreeGraph 2 offers two ways of adding new nodes. If you select a node before clicking New node a new child node of the selected node will be added. Alternatively you can select a branch and a sibling to the target node of the branch (including a new parent node for these two) will be added.
The red node was selected when a new node was inserted as a child.