Simply visit http://issues.ez.no/ezpublish , log-in with you share.ez.no account (login link at the top-right corner of the page), click "Issues" in the second-level top-menu bar, then "Add an issue (left part of the page, right above the issues list)". Then the proposed form is quite self-explanatory. When entering a request for enhancement, select the according type in the "Type" drop-down at the top of the right-column.
Let us know if you are experiencing issues,
(and please give us the link to the request ;) ) Cheers !
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Nicolas Pastorino
Director Community - eZ
Member of the Community Project Board