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.