To create an Edge in the Main Menu select Model -> Construction -> Add Edge.
There are two algorithms to create an Edge.
Firstly you can define an Edge through Point1 and Point2, which ares the points through which the Edge passes.
Arguments: 2 vertices.
The dialogue box to create an edge from vertices is:
Add Edge from vertices
Secondly you can define an Edge through Point and Vector.
Arguments: a vertex and a vector.
The dialogue box to create an edge from a vertex and a vector is:
Add Edge from a vertex and a vector
TUI command: Edges