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In the top right corner of GitHub Enterprise, click your profile photo, then click Your profile.  
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On the left side of your profile page, under "Organizations", click the icon for 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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Above the list of team members, click Add a member.  
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Type the username of the person you want to add and click Enter. The user will immediately be added to the team.  
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Review the list of repositories that the new team member will have access to, then click Add USERNAME to TEAMNAME.  
Article version: Enterprise Server 2.18
Adding organization members to a team
People with owner or team maintainer permissions can add organization members to teams. People with owner permissions can also add non-members to a team and the organization.