// Create a new workbook Workbook workbook = new Workbook(); ISignature signature = workbook.getSignatures().addSignatureLine( workbook.getActiveSheet(), 100.0, 50.0); ISignatureSetup setup = signature.getSetup(); setup.setShowSignDate(true); setup.setAllowComments(true); setup.setSigningInstructions(""); setup.setSuggestedSigner(""); setup.setSuggestedSignerEmail("example@microsoft.com"); setup.setSuggestedSignerLine2(""); // Save to an excel file workbook.save("AddSignatureLines.xlsx");