Documentation for JIRA 6.4 (This documentation includes the project navigation sidebar). Not using this? See below:
(JIRA 6.4 without sidebar documentation | JIRA 6.3.x documentation | JIRA Cloud documentation | earlier versions of JIRA)

Title: Working with an Issue  
Author: Andrew Lui [Atlassian Technical Writer] May 01, 2009
Last Changed by: Andrew Lui [Atlassian Technical Writer] Sep 07, 2012
Tiny Link: (useful for email)
Export As: Word  
Incoming Links
JIRA 6.4.x (2)
    Page: Extend JIRA
    Page: Using the Issue Navigator
Global Labels (1)