1. Open the Word document to be signed, and then click the "Insert" option in the top menu bar.
2. Select the "Signature Line" option in the drop-down menu, and two options will appear, namely "Microsoft Office Signature Line" and "Signature Line".
3. Right-click the signed picture and select the "Signature" command, and a dialog box will pop up, allowing users to set the color and transparency of the signature.
4. After setting the signature, click OK, and the user's signature will be added to the document.