Go to the marketplace on your client machine at http://marketplace.atlassian.com/ find the add on, look at the versions list to identify a compatible version, download that, then connect to your server and go to Admin -> manage add-ons, look for the "install add-on" link and feed it the file you downloaded.
Hi Jennifer,
it is easy. You should download this plugin. Obr file and upload it to JIRA
https://confluence.atlassian.com/display/UPM/Installing+add-ons
Never mind... I needed to search a little longer.
http://confluence.atlassian.com/display/upm/installing+add-ons
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