Documentation for JIRA 5.2. Documentation for other versions of JIRA is available too. 
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The changing of project keys is not covered by Atlassian Support and is considered to be risky as this involved manually manipulating raw .xml data. If you are not feeling confident with the procedures laid out in this guide please contact one of our Atlassian Experts for further advice on how to go about these changes. More options on this can be found here.
It is not currently possible to change the project key through JIRA's interface. The best way to do this is to: