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Note: If you are using SAML for authentication, the sign in page is presented by your identity provider and is not customizable via GitHub Enterprise Server.
Creating a custom sign in message
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Navigate to your enterprise account by visiting https://HOSTNAME/enterprises/ENTERPRISE-NAME, replacingHOSTNAMEwith your instance's hostname andENTERPRISE-NAMEwith your enterprise account's name.
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In the enterprise account sidebar, click Settings.  
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Under Settings, click Messages.  
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Under "Sign in page", click Add message or Edit message.  
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Under Sign in message, type the message you'd like users to see.  
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To see the rendered message, click Preview.  
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Review the rendered message.  
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At the bottom of the page, click Save changes.  
Creating a custom sign out message
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Navigate to your enterprise account by visiting https://HOSTNAME/enterprises/ENTERPRISE-NAME, replacingHOSTNAMEwith your instance's hostname andENTERPRISE-NAMEwith your enterprise account's name.
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In the enterprise account sidebar, click Settings.  
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Under Settings, click Messages.  
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Under "Sign out page", click Add message or Edit message.  
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Under Sign out message, type the message you'd like users to see.  
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To see the rendered message, click Preview.  
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Review the rendered message.  
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At the bottom of the page, click Save changes. 