Hi Nicole,
You'll have to do this yourself via the administration interface. Ask presenters to send you the paper, and then use the upload field in "B. Document Submission" to upload the file.
Regards,
Alec Smecher
Public Knowledge Project Team
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Don't miss the First International PKP Scholarly Publishing Conference
July 11 - 13, 2007, Vancouver, BC, Canada
http://ocs.sfu.ca/pkp2007/