Using the toolbar icons
1.Click the specific timing icon in the Timing Diagram toolbar.
2.Click in the Timing Diagram to insert the element. To insert multiple elements of the selected type, hold down the Ctrl key and click in the diagram window.
Dragging existing elements into the timing machine diagram
Elements occurring in other diagrams, e.g. classes, can be inserted into an Timing Diagram.
1.Locate the element you want to insert in the Model Tree tab (you can use the search function text box, or press Ctrl+F to search for any element).
2.Drag the element(s) into the state diagram.