To join the exchange, you’ll need an invitation. If you have been invited by an existing member, you can use their invitation code. If you don’t have an invitation from another user, you can use an invitation from Cardzilla itself — just click the Get invite button on the registration page. You’ll also need a valid email address to register.
During sign-up, you’ll choose a unique username. Choose carefully, it can’t be changed later! Your username will also be used in your public profile URL, like this
After registering, you’ll receive an email asking you to confirm your email address. Just click the link in that message, and once confirmed, new features will become available to you.