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To convert an HTML document to a PDF document with a signature using iTextSharp, you can follow these steps:

1. Load the HTML document using an HTML parser, such as HtmlAgilityPack.
2. Use iTextSharp to create a new PDF document.
3. Add the HTML content to the PDF document using iTextSharp's XML Worker.
4. Add a signature field to the PDF document using iTextSharp's SignatureAppearance class.
5. Save the PDF document.

Here's an example code snippet that demonstrates these steps:

// Load the HTML file
HtmlDocument doc = new HtmlDocument();
doc.Load("input.html");

// Create a new PDF document
using (FileStream output = new FileStream("output.pdf", FileMode.Create))
{
    Document pdfDoc = new Document(PageSize.A4);
    PdfWriter writer = PdfWriter.GetInstance(pdfDoc, output);

    // Open the document
    pdfDoc.Open();

    // Convert the HTML to PDF and add it to the document
    XMLWorkerHelper.GetInstance().ParseXHtml(writer, pdfDoc, new StringReader(doc.DocumentNode.OuterHtml));

    // Add a signature field
    PdfFormField signatureField = PdfFormField.CreateSignature(writer);
    SignatureAppearance appearance = signatureField.SignatureAppearance;
    appearance.SetVisibleSignature(new Rectangle(36, 748, 144, 780), 1, "signature");
    writer.AddAnnotation(signatureField);

    // Close the document
    pdfDoc.Close();
}

Note that this is just a basic example and you may need to customize the code to suit your specific needs.