I am not sure that I understand you correctly, I guess you are trying to change the assignee of an issue. This is a JIRA feature.
You can edit the assignee by hovering over the name of the Assignee, then use the Edit symbol to change the assignee. You can also use the Assign link at the top of the issue (or in the "More" dropdown) and change the Assignee there. To do this you need the "Assign Issues" permission for the Project the issue belongs to (see https://confluence.atlassian.com/display/JIRA/Managing+Project+Permissionsfor more information on Project permissions)
Hope this helps
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