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.
To add a signal reception to a classifier, the
signal must already be part of your model.
To add a signal reception to a classifier:
In the diagram editor, drag the signal onto the
classifier shape in the diagram.
Tip: The signals in your model need not appear
in the diagram editor. You can also drag a signal from the Model
Explorer view onto a classifier shape in the diagram
editor.