Depending on whether you are working on JIRA 7 or an earlier version the approach is slightly different.
For earlier versions you would do this through managing the add-ons and expand the details for the Service Desk plugin.
With JIRA 7 this is done in the new section versions and licences page. More details available https://confluence.atlassian.com/adminjiraserver070/installing-additional-applications-and-version-updates-765593207.html
Hope this helps.
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