How do I scan a document and write on it

The Apple document you got here from describes the sequence. See the section on signing a document. In that same section, see the text option right above the signature. Tap that, and drag it and re-size it where you want the text to be.

lori-el Said:

"How do I scan a document and write on it: How do I scan a document awn type in the blanks"

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Using OmniPage:

OmniPage is scan-to-PDF software, and would be worth it, if these are not hundreds of pages. All you would need to do is print out this document of screenshots, and then scan it with OnmiPage --- all would be saved as a PDF document or other options, and could fully editable as a MS Word Document.  Here is the Developer's Site: Kofax OmniPage Standard and Ultimate | Kofax