About team maintainers
People with the team maintainer role can manage team membership and settings.
- Change the team's name and description
 - Change the team's visibility
 - Request to add a child team
 - Request to add or change a parent team
 - Set the team profile picture
 - Edit team discussions
 - Delete team discussions
 - Add organization members to the team
 - Remove organization members from the team
 - Remove the team's access to repositories
 - Manage code review assignment for the team
 
Promoting an organization member to team maintainer
Before you can promote an organization member to team maintainer, the person must already be a member of the team.
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In the top right corner of GitHub Enterprise Server, click your profile photo, then click Your organizations.

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Click the name of your organization.

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Under your organization name, click Teams.

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On the Teams tab, click the name of the team.

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At the top of the team page, click Members.

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Select the person or people you'd like to promote to team maintainer.

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Above the list of team members, use the drop-down menu and click Change role....

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Select a new role and click Change role.
