Installed plugins need to be activated before they start working on your WordPress site.
Steps
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Navigate to your WordPress website management page.
[screenshot: website management page]
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Click the WordPress tab.
[screenshot: WordPress tab]
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In the Plugins section, find the installed plugin.
[screenshot: installed plugins list]
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Click the Activate button next to the plugin.
[screenshot: activate button]
Tip: After activating a plugin, visit your WordPress admin to configure its settings.