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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(PngFilePath))
    ' Initialize the font to be used for watermark
    Dim font As New Font("Arial", 19, FontStyle.Bold Or FontStyle.Italic)

    Dim watermark As New TextWatermark("Test watermark", font)

    ' Set watermark properties
    watermark.ForegroundColor = Color.Red
    watermark.BackgroundColor = Color.Blue
    watermark.TextAlignment = TextAlignment.Right
    watermark.Opacity = 0.5

    doc.AddWatermark(watermark)

    doc.Save()
End Using