Documentation for JIRA 6.3. Not using this? See below:
(JIRA 6.2.x documentation | JIRA Cloud documentation | earlier versions of JIRA)

Title: JIRA Administrators FAQ  
Author: Mark Chaimungkalanont Nov 08, 2004
Last Changed by: Andrew Lui [Atlassian Technical Writer] Sep 28, 2011
Tiny Link: (useful for email) https://confluence.atlassian.com/x/_yw
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    Home page: JIRA Documentation
Children (2)
    Page: Usage FAQ
    Page: Installation Notes
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    https://answers.atlassian.com/tags/jira/