Click "Get Started" in the right-hand corner of exodus90.com, or simply follow this link here - https://app.exodus90.com/auth/login. Click the orange button at the bottom of the page that reads "Sign Up".
You will then enter your name and email address and set a password for your account.
You will receive a confirmation code via email. Enter that code to gain access to your account. This will make you the defacto leader of the fraternity. You will then be able to set your start date and invite other men to join you via email. If you know that someone else is leading your fraternity, there is no need to register onsite. Your leader will invite you.