How would I make a Global Event? (Cross-Server Events)

Hello! I am SpiralGaia. I am trying to make an event occur on all servers, but I can not figure it out. I have found a module, that can be linked here, but I do not understand it as it does not have any documentation and messaging service is totally new to me. Can someone explain how I would be able to use this?

https://developer.roblox.com/en-us/api-reference/class/MessagingService