If you wish to appeal a Discord punishment, you will need to provide your Discord User ID.
Your Discord User ID is an eighteen digit number, and is not the same as your username. You can find your User ID by following the steps below:
- On Discord, go to Settings > Appearance
- Scroll down and make sure that Developer Mode is on
- Exit your settings and type a message in any channel on any server
- Right-click your profile picture and click 'Copy ID', as seen below: