For more information about publishing sources, see "About GitHub Pages."
Choosing a publishing source
Before you configure a publishing source, make sure the branch you want to use as your publishing source already exists in your repository.
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On GitHub, navigate to your site's repository.
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Under your repository name, click Settings.
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Under "GitHub Pages", use the None or Branch drop-down menu and select a publishing source.
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Optionally, use the drop-down menu to select a folder for your publishing source.
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Click Save.
Troubleshooting publishing problems with your GitHub Pages site
Note: If your site has not published automatically, make sure someone with admin permissions and a verified email address has pushed to the publishing source.
If you choose the docs folder on any branch as your publishing source, then later remove the /docs folder from that branch in your repository, your site won't build and you'll get a page build error message for a missing /docs folder. For more information, see "Troubleshooting Jekyll build errors for GitHub Pages sites."