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Login to your control panel.
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Search and download the plugin you want here: https://hub.rocketmod.net/.
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Enter your file manager and navigate to Server/UnturnedServer/Rocket/Plugins.
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Upload the files of your unzipped plugins.
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Restart your Unturned server, your plugins should now work.
NOTE: Make sure you have Rocket installed, to find out how to install Rocket Mod click here.