Excel Select Chart Index

i have the following code:

Code:

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Sub GetTLineEq()
  Dim chrtobj As ChartObject
  Dim chrt As Chart
  Dim srs As Series
  Dim tline As trendline
  Dim dlbl As DataLabel
  Dim str As String

  With ActiveSheet
    Set chrtobj = ActiveSheet.ChartObjects(1)
    Set chrt = chrtobj.Chart
    Set srs = chrt.SeriesCollection(1)
    Set tline = srs.Trendlines(1)
    Set dlbl = tline.DataLabel
    str = dlbl.Text
    .Range(Selection.Address).Value = str
  End With
End Sub

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This code only works for ChartObjects(1), but I would like it to work with the chart that I selected. I have many charts in the sheet. Many thanks

Sorry wrong thread.