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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(DocFilePath))
    Dim font As New Font("Times New Roman", 8)
    Dim watermark As New TextWatermark("Test watermark", font)

    ' Set watermark coordinates
    watermark.X = 10
    watermark.Y = 20

    ' Set watermark size
    watermark.Width = 100
    watermark.Height = 40

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