About custom footers for GitHub Enterprise Server
You can configure the web UI for GitHub Enterprise Server to display a custom footer with up to five additional links. The custom footer appears above the default GitHub footer, to all users and on all pages.
Configuring custom footers
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In the top-right corner of GitHub Enterprise Server, click your profile photo, then click Enterprise settings.

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In the enterprise account sidebar, click Settings.
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Under Settings, click Profile.
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At the top of the page, under the navigation bar, click Custom footer.

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Under each "Footer Link" heading, type a title and URL.
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To save the content and display the custom footer, click Update custom footer.