If you own your domain, you can redirect it or a subdomain to your game server IP - meaning you...MineCraft Server OP Commands
Server/op Commands Minecraft Operator-only commands Before using an OP command...Admin commands
You must log on as admin before typing admin commands. Both logon and admin commands have to be...Setting up permissions (GroupManager) with McMyAdmin.
When it comes to Minecraft permissions, there are approximately a dozen alternatives you can use....Getting Started with your server - basics
Assuming you are rather new at administrating a Minecraft server and easily want to get started...