For irregular lines Go to to the ‘Lines’ section. Select ‘Freeform: Shape’ You can draw curved lines using your stylus, or for straight lines you can click on the corners. To finish the shape double click.
To change colours Go to ‘Shape Format’ at the top, or right click on the shape. Change the ‘Fill’ and ‘Outline’ to the colours you want (or have ‘no outline’)
To change the transparency Change the transparency of the colour by right clicking on the shape, clicking on ‘Format Shape’
Example:
An example of a map using overlays - the Mareeba Rodeo