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How do I add a real signature stamp to Acrobat DC?
What do you mean by "real" signature?
Just guesing, but I think what you're after is to have your signature as an image (instead of Heletica text in the signature panel).
Go to Preferences > Signatures > Creationand Appearance > More
Then in the Appearances section, click Edit.
In the Configure Graphic section, choose "Imported Graphic" and then navigate to the scan (or photo) of your signature.