REGISTER FOR A TOURNAMENT
Head to rk9.gg and sign in with your email address. We use Google Accounts for authentication, so this email needs to be connected to a Google account if it is not already. We believe Google has best-in-class account security features, and so we rely on them to vouch for who you are (authentication), and then we allow you to access certain things (authorization).
If you need to connect your email, https://support.google.com/accounts/answer/27441 has instructions on how to use an existing email address. Once it has been connected to a Google Account, Google will be able to identify you for authentication purposes.