Adding signal receptions to classifiers
In your UML model, you can
add signal receptions to a classifier to indicate that the classifier
is ready to respond to a signal. The signal reception identifies the
signal and specifies how the receiving object should respond.
Before you begin
Procedure
In the diagram editor, drag the signal onto the classifier
shape in the diagram.
What to do next

Tip: The
signals in your model need not appear in the diagram editor. You can
also drag a signal from the Project Explorer view
onto a classifier shape in the diagram editor.