Can I add a watermark to a form I created?
If the form is a web form then no, there isn't anything like a watermark for the web form.
If the form is a PDF then sure, you can add a watermark as you would to any PDF (steps available through Google or Acrobat forums, or Acrobat Help).
If you need to edit a FormsCentral form in Acrobat refer to this FAQ: http://forums.adobe.com/docs/DOC-3661
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