This example adds a new five-point star to slide one using the coordinates (288, 100). It then converts those coordinates from points to pixels, uses the RangeFromPoint method to return a reference to the new object, and changes the fill color of the star.
Dim myPointX As Integer, myPointY As Integer
Dim myShape As Object
ActivePresentation.Slides(1).Shapes _
.AddShape(msoShape5pointStar, 288, 100, 100, 72).Select
myPointX = ActiveWindow.PointsToScreenPixelsX(288)
myPointY = ActiveWindow.PointsToScreenPixelsY(100)
Set myShape = ActiveWindow.RangeFromPoint(myPointX, myPointY)
myShape.Fill.ForeColor.RGB = RGB(80, 160, 130)