Welcome to the team
If you are already in the Discord:Then you will have received an email from Launch Pass. Copy this code into the DM from the Launch Pass Bot. Hit Send, and you will gain access to the new content
If you are not already in the Discord:
Register for an account, and install their app: https://discordapp.com/ . After doing this, you will have an email from LaunchPass. Click on the link within to get invited to the Discord server as a Premium member.