How to Manually Install a Plugin in WordPress?
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Make sure you already downloaded a zip file of the plugin to your desktop.
1. Login to your WordPress admin dashboard.
2. Under the dashboard ., hover your mouse over "Plugins" and click on "Add New".
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3. Click on "Upload Plugin" and then on "Browse". Chose your plugin"s zip file and then click on "Install Now".
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. Click on "Activate Plugin".
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Note: The newly activated plugin will show in the sidebar .. If a setup of the plugin is required, it will show an option to complete it.