You can enable the Private Shows from the Pricing settings of your model account, which is located in the top right side, or can be accessed directly at the link: https://hotica.com/account/pricing-settings while you are logged into your model account.
Here you can enable the Private show mode, Spy Show mode and set the pricing accordingly.
Once you have set the Prices and Saved Changes, the customers will see a Request Private button on their side.