I thought it was a tad confusing because you have to keep going and only use the top half.
The message board on the bottom is just that...to send messages. It doesn't have anything to do with the bookings.
(ignore the contact page on a white background on the bottom because it shows up on every page)
Go to Booknow, then select Book it for the type of reading you want.
Then the schedule online page shows up.
Switch to your timezone, select your date/time.Then select Next.
Enter your contact information, along with any message [STILL WORKING IN THE TOP HALF]. Then select Next again.
A payment information page shows up with three options (cc, paypal or pay in person)
Then select Pay Now.