A Flag Marker may be inserted in any slide or group of slides by first selcting them and then right clicking. The menu shown to the rigt will appear. Click on Flag Slide and the Flag Marker will be added to the Slide Sorter thumbnail.
The Flag Marker is use as a placemark to make it easier for you to come back to a slide for addititiona editing.
A Flag Marker 
may be inserted in any slide or group of slides by first selcting them and then right clicking. The menu shown to the rigt will appear. Click on Flag Slide and the Flag Marker will be added to the Slide Sorter thumbnail.