You haven't told us what user authtication system you're using (OnDemand's user management, your own Crowd, interal Jira, external LDAP etc), and you haven't told us what you've tried and what doesn't work.
If you can't answer those directly, then the simple question to get started is "What do you get when you try Admin -> User management type options"?
[Note: So it was my turn for Friday Fun and sadly I was sick thanks to rubbish sinus infection... so apologies to most of Europe and Asia for the delayed post. However, I finally got out of bed for t...
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