Do one of the following:
Drag a modeling element from the toolbar and drop it on the canvas.
Drag a web service operation from the Project Explorer and drop it on the canvas.
Click the default activity name and type a new name.
The activity appears on the modeling canvas.
Every activity name must contain at least one character (A-Z, a-z, or 0-9); it must start with a letter or an underscore (_), and it may contain spaces.