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Log on as a member of both the Enterprise Admins group and the root domain's Domain Admins group.
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In Server Manager, click Manage, and then click Add Roles and Features. The Add Roles and Features Wizard opens.
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In Before You Begin, click Next.
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In Select Installation Type, ensure that Role-Based or feature-based installation is selected, and then click Next.
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In Select destination server, ensure that Select a server from the server pool is selected. In Server Pool, ensure that the local computer is selected. Click Next.
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In Select Server Roles, in Roles, select Active Directory Certificate Services. When you are prompted to add required features, click Add Features, and then click Next.
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In Select features, click Next.
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In Active Directory Certificate Services, read the provided information, and then click Next.
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In Role Services, click Certification Authority, and then click Next.
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Click Install button.
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Wait until installation is completed, click Close button.
