When in change polygon mode, the following actions can be performed until a new command is executed or the change polygon command is canceled:

• To move any point, click on it. After clicking, the point will follow the mouse, and the polygon outline will update as the mouse moves. Once the mouse is in the desired new location for the point, click again to move the point to the new location.
• To delete any point, move it so that it is in the same location as one of its adjacent points. (It must be moved to an adjacent point to delete it. If it is moved over any other point in the polygon, an error will be displayed.)
• To add a new point, move the mouse near the center of one of the existing polygon edges. A new point will appear, and the mouse cursor will change to a target with a plus sign. Click, and a point will be added at that location. The newly created point can then be moved to the desired location.