I am assuming you are referring to a PDF workflow and are not planning to collect data with FormsCentral, if I am not correct please let me know.
Is this for a PDF created by FormsCentral? If it is you'll want to look at this FAQ about how to edit a FormsCentral PDF form in Acrobat: http://forums.adobe.com/docs/DOC-3661
This help doc describes how to add an Email Submit button to PDF: http://help.adobe.com/en_US/acrobat/X/pro/using/WS58a04a822e3e50102bd615109794195ff-7dd6.w .html
And this YouTube video shows the process: http://www.youtube.com/watch?v=Jql1wp5Gofs