Enabling branch restrictions
Protected branches are available in public repositories with GitHub Free, and in public and private repositories with GitHub Pro, GitHub Team, GitHub Enterprise Cloud, and GitHub Enterprise Server. The ability to restrict branches is a type of branch protection that's available for public and private repositories owned by organizations in GitHub Team, GitHub Enterprise Cloud, and GitHub Enterprise Server. For more information, see "GitHub's products."
Organization owners and people with admin permissions for organization-owned repositories can enforce branch restrictions so that only certain users or teams are able to push to a protected branch.
You can automatically enforce protected branch settings for some or all branches in your repository. For more information, see "Configuring protected branches."
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On GitHub, navigate to the main page of the repository.
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Under your repository name, click Settings.
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In the left menu, click Branches.
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Next to "Branch protection rules", click Add rule.
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Under "Branch name pattern", type the branch name or pattern you want to protect.
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Under "Rule settings", select Restrict who can push to matching branches.
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Select Restrict who can push to this branch.
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Search for and select the people or teams who will have permission to push to the protected branch.
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Click Save changes.