Edit Menu

UndoUndoes any action taken in the editor window.
Redo Redoes any action that was previously undone by the undo button.

ClearClears the drawing area of the editor.

Delete selected graphsDeletes the selected graphs from the graphlist right of the drawing area.

Selection ToolSelects the selection tool. When this tool is selected, you can select vertices or edges in the graph. You can then drag them to another location or delete them.
Creation ToolSelects the creation tool. When this button is selected, you can create new vertices by clicking on the position where you want them. If you want to create a new edge just click on the first endpoint and hold the mouse down while moving to the second endpoint. If you don't stop on an existing vertex a new vertex will be created on the location where you released the mouse. If you click on an edge it will be split and a new vertex will be added.

ComplementReplaces the current graph with its complement.
ClosureConstructs the closure of the current graph.
Line graphConstructs the line graph of the current graph.