To better help you I would suggest to raise a support ticket at our support.atlassian.com and then explain a little more to us your scenario and what you need with your Confluence 4, unfortunately just per this description is not so clear.
If this link is on an existing page, are you getting any error when trying to edit it manually during a page edit?
Alternatively, you can change it via database if it's not possible through the GUI. Just go to the BODY_CONTENT table that stores the content for all pages and look for the contentid of the offending page (should be on the CONTENT table).
Please let me know if I understood you correctly here.
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