Apply style to selected text not selected box

[Exposian]

Hi guys!
this is going to be easy for any VBA expert out there so, apologies for the novice question! I have a code to condense text into a text box. At the moment the code condensed all the text inside the text box but I want the code to work for selected text only. How can I modify this code to make it work?

Many thanks on advance!
PJ

Sub CondenseText()


    On Error GoTo Catch


    Dim o As Shape, b As Boolean
    Set o = ActiveWindow.Selection.ShapeRange(1)
    If Not o Is Nothing Then
        With o
            .TextFrame2.TextRange.Font.Spacing = .TextFrame2.TextRange.Font.Spacing - 0.1
        End With
    End If
    Exit Sub
Catch:
    If Err.Number = -2147188160 Then MsgBox CG_NOTHING_SELECTED
End Sub

[John Wilson]

Sub CondenseText()
    On Error GoTo Catch
    Dim o As TextRange2, b As Boolean
    Set o = ActiveWindow.Selection.TextRange2
    If Not o Is Nothing Then
        With o
            .Font.Spacing = .Font.Spacing - 0.1
        End With
    End If
    Exit Sub
Catch:
    If Err.Number = -2147188160 Then MsgBox "NOTHING_SELECTED"
End Sub