Doesn't allow client side booking

Dear Plugin Author ,

I love your demo and was shocked because after pasting the short code on my page. it doesn’t allows customers to book but it only shows the calendar . how do i enable customer’s to book using the calendar ?
I have already purchased your premium version .

My Site URL :http://www.dualify.com/appointments/

Do get back soon . Thanks in advance.

Sincerely,
Redman45 .

http://ww.wp.xz.cn/plugins/booking/