The manual has not been updated yet to cover 1.06
Highlight your freeway. On the "Properties" tab you will see the properties of the freeway, including the NumberOfLanes and TrafficDirection. No need to edit the DBF file anymore since you can set traffic direction and number of lanes directly from within FSX KML.
The "Vertices" tab will show you all the vertices in your line or polygon. Click the "edit" button and a window will pop up and allow you to manually edit values if you so desire. You can use the "Set Elevation" button to set elevation of all vertices which is useful if you are creating lakes that need to be elevated.
The "XML" tab shows you the XML of the highlight node.
In upcoming 1.07 i am adding shape viewing/editing capabilities, see this post for a preview
http://www.fsdeveloper.com/forum/showthread.php?t=4702