To create a Xamarin Bugzilla account, you will first pick an email address that is associated with your GitHub account. If you do not yet have a GitHub account, you will need to create one and then add and verify the email address that you wish to use for Bugzilla in your GitHub account settings. Xamarin's Bugzilla uses this GitHub verification as a type of captcha.

Click the button below to redirect to GitHub, and then complete the approval process on GitHub to allow Bugzilla to access your email information.

(If you already have an account and just want to change your email address, you can change it from the Preferences page after logging in.)