if you are trying to OPT IN for NVC Electronic Processing (China/Guangzhou bound filers can do this, BTW)
then
that DS-3032 form must be filled out and signed by the BENEFICIARY (not the petitioner), then re-scanned/converted back to PDF format,
and then
attached to an email, sent in (with the right body of the email, in ascii text) to nvcelectronic@state.gov
The 'right' DS-3032 to use, for EP, is in a link for DL over at http://www.visajourney.com/wiki/index.php/NVC_Electronic_Processing
don't use the one that might have shown in in an email, with a barcode in it - it's the wrong one to use (it's outdated)
Good Luck !
