You can register for each of the classes here ($20 per class). Check each box and choose a 0 or a 1 depending on which classes you want to race. The price will be calculated automatically.
By paying your registration fee you explicitly indicate that you have read the attached rules and you agree to abide by these rules. Your cars can be scrutinised at any time.
The rules are attached to this page but you will need to scroll through to see all of the pages.
Add your order to the cart and then go to the basket at the top right hand corner of this page to check-out and make payment.