change the icon/marker

Does anyone know how to change the icon of the marker?

I tried someting like:

[map lat=”37.77493″ lng=”-122.41942″ icon=”URL”]
Text you would
like to appear
as a tooltip
goes here
[/map]

But it doens work :(. Would be great if someone could help..

https://www.ads-software.com/plugins/simple-map/