Open the signed PDF in a PDF editor that supports signed documents
Check whether the signature is certified or locked
If the PDF is locked, remove the signature only if you have permission and the signing workflow allows it
Save a copy of the original PDF before making changes
Edit only the allowed fields if the signature permits form editing
Use a PDF editor to modify text, images, or pages if the document is not locked
If the signature must remain valid, do not alter any signed content
Add changes in a new version of the document if required
Re-sign the PDF after editing if a new signature is needed
Use a digital signature workflow that supports multiple signatures if applicable
Export the edited file as a new PDF
Verify the final document and signature status after saving