EDIT: This is resolved. It was a permissions problem, duh. 
When an IDEA is "Accepted" and converted to an issue in a particular Jira space (we use "HC" for Home Care), it is no longer editable. I am the Assignee on an IDEA that has been Accepted, but I am no longer in Home Care, so I want to remove myself as the Assignee so this issue doesn't show in my "Assigned to Me" filter on my dashboard. How can I remove myself as the Assignee from an Accepted IDEA?