This example appends the string ": Test version" to the end of the title on slide one in the active presentation.
With Application.ActivePresentation.Slides(1).Shapes(1)
.TextFrame.TextRange.InsertAfter ": Test version"
End With
This example appends the contents of the Clipboard to the end of the title on slide one.
Application.ActivePresentation.Slides(1).Shapes(1).TextFrame _
.TextRange.InsertAfter.Paste