The Online Journalism Blog readers’ map – what to do if your entry has been changed
If your entry has been incorrectly amended you can edit it by clicking on your placemark or listing in the left hand column.
Then go to the top of the left hand column and click ‘Edit’. Both the map name and the selected placemark become editable. Edit your placemark then click OK.
It seems Google Maps has some way to go before being intuitive enough for the average reader to contribute to.