Adding Connector Lines
To connect two Shapes with a Connector Line, hover your mouse over the side of a shape. You will see a red dot appear. Click your mouse and drag the Connector Line to the second Shape. When you see a red dot appear around the second Shape, release your mouse click and the Connector Line will be attached to both shapes. To connect to other icons/images, use the Line tool (left menu). This short video walks through everything...