Hi Ramón,
Currently only the administrator can manage a repository. We've had a few requests for submitter-based repository management, and I'd certainly like to add support for it in the future, when we have the chance to work on it and work out all the security and permissions details.
Regards,
Alec Smecher
Public Knowledge Project Team
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July 11 - 13, 2007, Vancouver, BC, Canada
http://ocs.sfu.ca/pkp2007/