MainWP manages multiple WordPress sites from one Dashboard. Security Ninja connects through an extension you install on that Dashboard only. Child sites need Security Ninja itself, not the MainWP addon.
Start here for a full premium setup (license, child sites, and sync):
More guides:
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Get started with MainWP
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Install the free MainWP extension
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Access Security Ninja in MainWP
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Show or hide the Security Ninja column
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Bulk actions in MainWP
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Copy settings from MainWP
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Manage IPs from MainWP
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Use the Security Ninja Events tab
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Set up fleet email alerts
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Control white label settings remotely
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Security Ninja tokens in MainWP Pro Reports
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Sample templates for MainWP Pro Reports
Release notes: Security Ninja for MainWP changelog.