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' For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
Using doc As Document = Document.Load(Utilities.MapSourceFilePath(XlsFilePath))
    Dim font As New Font("Calibri", 12)
    Dim watermark As New TextWatermark("Test watermark", font)
    watermark.HorizontalAlignment = HorizontalAlignment.Right
    watermark.VerticalAlignment = VerticalAlignment.Bottom

    ' Set absolute margins. Values are measured in document units.
    watermark.Margins.Right = 10
    watermark.Margins.Bottom = 5

    doc.AddWatermark(watermark)
    doc.Save()
End Using