To add a circle to your diagram, follow these steps:
| 1. | Click the Circle icon  in the Draw toolbox or select Circle from the Draw menu. |
| 2. | Move the cursor  in the drawing window to the position of the center of the circle and click once. |
| 3. | Move the cursor to draw the circle in the desired size and click again. |
Notice the circle is displayed with 2 points, the center and a point on the perimeter.
You can adjust the circle in Select 
mode. 