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On GitHub, navigate to the main page of the repository.
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Under your repository name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.
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Under Features, deselect Restrict editing to collaborators only.
Changing access permissions for wikis
Only repository collaborators can edit a public repository's wiki by default, but you can allow anyone with an account on your GitHub Enterprise Server instance to edit your wiki.