Private posts are only visible to team members and organization owners, and public posts are visible to all members of the organization. For more information, see "About team discussions."
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In the upper-right corner of GitHub Enterprise Server, select 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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Click the name of the team. 
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At the top of the team's page, click Discussions.  
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Type a team discussion title and a comment to start a conversation. 
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Optionally, select whether you want your post to be private or public using the drop-down menu. 
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Click Comment.