I created a UDF but I can't run the function. Do I have to save the function
under the worksheet or workbook or something else? Also, do I need the
Analysis toolpak - VBA to make the function work. The function is as follows:

Function GetHyperlinkAddress(Rng As Range) As String
With Rng
If .Hyperlinks.Count 0 Then
GetHyperlinkAddress = .Hyperlinks(1).Address
End If
End With
End Function