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From Our In-Built Plugin Installer:

1

First Step

Log in to your Wepwawet Control Panel
2

Second Step

Select your server.
3

Third Step

Under the Minecraft Section, Go to the Plugin tab and search for the plugin you want to install.
4

Fourth Step

Click on Install and wait a few seconds
5

Fifth Step

After that, Head over to the Console tab and Restart your server.
You now know how to install plugins.