Hmmm, well I forgot you are still a newbie.
Well, from your question I can smell you don't have any idea of what discord is; Discord is an app which you can use in chatting kinda works like WhatsApp but more complex if I'm not mistaken 🤪.
So when you have a account in discord you are entitled to have a user name. For example this is my own username on Discord server 👉rickardoh#6975.👈
So, I hope you get me now?