Enter your Student ID.
Make sure to pick your sport. It's the sport that has your name on it's roster, and not the sport that you would like to get a ticket for.
A quick example of the login process:
You are a Men's Golfer who would like to attend a Football game. You choose the Men's Golf program (the sport that has your name on it's roster), and fill in your valid UH email address and Student ID. Hit the Signup button, and you're in.