How did I break the course enroll button?

Good Afternoon,
Thank you for your support. It's so fast and terrific. I'm updating my website front page and broke the Shortcode for my course sign-up button. What did I do wrong?
http://comedy101.chuckroy.com/

The Introduction To Comedy course used to have a sign up button. I deleted some text bellow the button and must have deleted part of the button code. Can you help get the sign-up button back?
Thanks,
Chuck