In a use case diagram, an actor represents a role played by an outside object. One physical object, therefore, can be represented by several actors. A communicates relationship indicates how an actor participates in a use case.
Learn why an Actor shape has red error marking
Right-click the shape, and then click Display SemanticErrors. Read the error message selected in the Errors tab of the Output window.
Name an Actor shape and add other property values
Open the element's UML Properties dialog box by double-clicking the icon that represents the element in the tree view or the shape that represents the element in a diagram.
Control which property values appear on a shape in a diagram by right-clicking the shape, and then clicking Shape Display Options. In the UML Shape Display Options dialog box, select and clear options to display or hide property values.
Hide the name or stereotype of an Actor shape
Right-click the shape, click Shape Display Options, and then clear Name or Stereotype.
Show documentation and other tagged values associated with an Actor shape
Right-click the shape, click Shape Display Options, and then select Properties.
Navigate to other views of the actor
Right-click the shape, click Views, select the view you want, and then click OK.