If you are participating in a Generation Global even that requires you to enter a code, you can do this when you are creating your account or in your profile if you already have an account on the Ultimate Dialogue Adventure.
If you are a new user, you can add multiple event codes as you are completing your registration form on the Ultimate Dialogue Adventure (after Part 1 of the Learning Dojo).
If you already have an account on the Ultimate Dialogue Adventure, log in, then select "My profile" -> "View profile" and click on "Update my details".
Then enter the code(s) in the section "Do you have an event code?"
Remember to click on Save changes.