You can send commands to your game console using RCON without the need of any plugins.
The ports you use with RCON must be open on both your web hosting and game server VPS.
From your Minecraft Server files open the server.properties file.
rcon.port=PORT (10289 RECOMMENDED)
Save the file and restart your server.
Enter these details to your website's Add/Edit Server section. Press the "Test Connection" button to check if it works.