About user messages
You can create global announcement banners, which appear at the top of every page.
You can use Markdown to format your message. For more information, see "About writing and formatting on GitHub."
Creating a global announcement banner
You can set a global announcement banner to be displayed to all users at the top of every page within your enterprise, including every page in every organization owned by the enterprise.
You can also create announcement banners at the organization level. For more information, see "Creating an announcement banner for your organization."
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In the top-right corner of GitHub, click your profile photo.
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Depending on your environment, click Your enterprise, or click Your enterprises then click the enterprise you want to view.
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On the left side of the page, in the enterprise account sidebar, click Settings.
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Under Settings, click Announcement.
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Under "Announcement", in the text field, type the announcement you want displayed in a banner.
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Optionally, under "Expires on", select the calendar drop-down menu and click an expiration date.
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Optionally, to allow each user to dismiss the announcement, select Allow users to dismiss the announcement.
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Optionally, to preview your message, click Preview.
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Click Save changes.