Change to curve - changes a straight line to a curve

Change to line - changes a curve to a straight line

Change to move - splits a path

Add point - adds a point in the middle of the selected line element

Delete - deletes the selected point and line element

Open - opens the first and last point of a closed path

Close - joins and closes the first and last points of an open path

Change Position - enter new co-ordinates for the selected point