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You can administrate Group Ambassadors from its admin page which is located on the "Manage apps" page, accessed by the sidebar:
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Nominating a group Ambassador
You can use the top form in the admin page to nominate any user or any group Ambassador for any group. Just start typing a name and a group name and click on "Save", a notification will confirm the success of the operation and the list will refresh:
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Revoke Ambassador privilege
You can use the "Revoke" action in the "Current Group Ambassadors" to revoke an Ambassador privilege for a group to any user. As you might have guessed, the Revoke action will revoke privilege for the group named on the same line 
A notification will confirm the privilege have been successfully revoked:
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Starting with version 1.8.4 weWe've introduced a new view for current Ambassadors and revoking Ambassador privilege is done in two simple steps:
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A new window will display the groups the user is currently Ambassador of, you can then use the "Revoke" link button from there!
Monitoring Group Ambassadors Logs
With version 1.1, Group Ambassadors now allows you to monitor Ambassadors nomination and privileges revokation. You can access the Group Ambassadors Logs using the "Log" menu in the "Manage apps” section of Jira's administration or by using the "Logs" entry in the "GG menu" (as described above).The logs will show as follow:
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Logs can be filtered to retrieve actions related to either a User (ambassador status logs) or a group using the dropdowns above the list. |
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As of now, only System Administrators can flush the logs. The logs table will be emptied |
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Admin Tools
Admin Tools module is a set of Tools which can help admins of Group Ambassadors for complex actions such as :
Find all ambassadors for a group
Nominate an Ambassador to all groups
Revoke all Ambassador privileges for a user (revoke Ambassador status for all groups it was active)Clearing tool (Group Ambassadors keeps trace of group names and users in a database which is not aware of any group or user deletion, those tools delete all reference to non existing items)
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You now are a five-star Group Ambassadors' admin 