Manual

Components

Selecting/deselecting

[Left-click] on component.
Multi-select: Press [Ctrl]  and [Left-click] on several components.
 

Insert net components

[Right-click] on the white drawing area and chose Add Transition / Add Place.
 

Deleting components

Select one or more components and press the Del-key.
 

Connecting components

Dragging the mouse while pressing [Space + left-mouse] from one component to another. Creates a connection.
 

Toggle tokens

[Right-click] on the place and chose Token. 
 

Toggle visibility for places

[Right-click] on the place and chose Visible. 
 

Signals

Assigning signals to transitions

[Double-click] on transition to edit properties.
 

Adding signals

[Double-click] on transition to open the properties dialog box. Here new signals can be added to the STG.
 

Renaming signals

[Double-click] on signals in the signal-tree (left side of application) to open the signal property dialog box.