Yeah, you need to download the discord app. The chat is called 'orthodontics worldwide'
Have you got an invite link? I couldn't find it through the Discord search function.
http://dereferer.org/?http://dereferer.org/?https://discord.gg/YbqXzp9
http://dereferer.org/?http://dereferer.org/?https://discord.gg/waba9rWLeaving an invitation link here in case anyone doesn't know about it yet.