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Signed documents have the Signatures button at the bottom of the document.
Click the File tab.
Click Info.Click Protect Document, Protect Workbook or Protect Presentation.Click Add a Digital Signature.Read the Word, Excel, or PowerPoint message, and then click OK.In the Sign dialog box, in the Purpose for signing this document box, type the purpose.Click Sign.After a file is digitally signed, the Signatures button appears, and the file becomes read-only to prevent modifications.
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Tim from https://scamfighter.net/review/boomessays.com