Your Discord ID is going to be your chosen handle, followed by “#xxxx” where the x’s are numbers. For example, your fun uncle Bob that runs a Friday night Pathfinder game for you and your cousins might be “UncleBob” or “GrandWizardofWeird” in the chats, but his actual discord ID might be something like “UncleBob#7512″. The name in a channel isn’t fixed or unique like the Discord ID is.
If you don’t know your Discord ID, it’s easy to find. Just open a chat you’d been in and tap your name. It will put “@yourDiscordID” in the chat box. Just drop the “@” and you have your Discord ID!