If you prefer, you can use the email address you have already provided instead of the system generated username.

You can change your password, but not your username, after you have logged in for the first time using the credentials supplied in the system generated email.

When you log in you will be taken to the existing Members Page of the website from which you an access the usual protected pages of the website, including the event sign-up sheets. You will no longer have to login again to access these pages.