It's not directly possible in the greenhopper detail view. You first have to open the issue in the normal JIRA issue detail view through clicking on the issue key in the greenhopper detail view. In the normal JIRA view you should see a trash can icon if you hover over an attachment. If not, you should check your permissions as mentioned in the answers from Timothy and Matt.
...PermissionsStartOnly=true User=www-data Group=www-data ExecStart=/opt/jira/bin/startup.sh ExecStop=/opt/jira/bin/shutdown.sh TimeoutStartSec=120 TimeoutStopSec=600 PrivateTmp=true [Install] WantedBy...
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