On the Class Schedule page each class has a "PayPal" button to the right of it. Click and pay. Easy Peasy.
Some people don't have, or want, PayPal accounts. You can pay using a credit card at PayPal without creating an account.
Some people just don't want to deal with PayPal at all. No problem, go to the "Contact Us" page and send us an email. Tell us which class you want to attend and we'll send you an invoice. Once we get your check, we'll let you know. Once your check clears, we'll reserve your space.
Sorry, we were told "I'll pay you on class day" a few too many times by no-shows, so now it takes money to reserve a class space.