Yes.
Select the image for which you want to change the location info, and then drag the marker that appears on the map to any position.
When the confirmation message appears, click [YES] to change the location info.
Yes.
Select the image that you want to revert, and then click the [Photo Info] button. When the Photo Info screen appears, click [Revert] to return the data to conditions at the time of shooting.
Yes.
Double-click the location info icon that you want to delete, and then click [Delete Marker].
When the confirmation message appears, click [YES] to delete the location info.