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"?
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Any other country that celebrates Midsummer holiday (this friday 22 June)?
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