Greenhopper is included in the current release of JIRA. So all you should need to do it go to the Greenhopper licensing page (you can get to it off the first page in the Administration section) and enter your license, either evaluation or production.
When you go into the "Administration" (link is next to your name in the upper right of the screen) for JIRA, on the first page you will see a summary of "Projects", "Plugins", "Users", "System".
In the section called "Plugins" you will see smaller sections called "Plugins", "Application Links", "Source Control", "Builds", "Agile". In the Agile section you should see a option there for "License Details". Click in there to enter you license. It also has a link to your "My Atlassian" page in case you haven't downloaded your license yet.
I'm assuming here that you are using JIRA 4.4.x. If that is incorrect, let me know and I'll provide instructions on the old way (if I can remember them).
Atlassian Summit is an excellent opportunity for in-person support, training, and networking.Learn more
Hey everyone! My name is Natalie and I'm an editor of the Atlassian Blog and I've got a question for you: What's your favorite quote about teamwork? We've compiled a list here, along with...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG