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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 relative margins. Margin value will be interpreted as a portion of appropriate parent dimension.
    ' If this type is chosen, margin value must be between 0.0 and 1.0.
    watermark.Margins.MarginType = MarginType.RelativeToParentDimensions
    watermark.Margins.Right = 0.1
    watermark.Margins.Bottom = 0.2

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