In a statechart or activity diagram, a simple transition is a relationship between two states or action states or between a state and itself. A complex transition 
Name a Transition (Fork) 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.
Tip: Control which property values display 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.
