Sign a document
1.Make sure that you have finished making changes to the document.
2.Do one of the following:
If the document includes a signature field, use the Hand tool to click it.
Choose Document > Digital Signatures > Sign This Document.
3.If the document has not been signed, you’re asked if you want to certify the document or continue signing. To sign the document, choose Continue Signing, and follow the steps.
You may also want to:
Set up a digital ID
Share certificate information
Change signature appearance

Signature Topics
About adding signatures in complete Help