I am using Pay With a Like and the custom selection with

Hi, I am using Pay With a Like and the custom selection with the short code doesn't work. I read your https://premium.wpmudev.org/project/pay-with-a-like/#usage site very carefully, but the provided screenshots and descriptions doesn't fit to any of my interfaces.

For example in my edit post window there is no "selection" choice. Just enabled and disabled. I can insert the short code manually but if I chose disabled it doesnt work and if I choose enabled, the automation drops in and the content is cut down at the beginning, not at my marked place! Please help me with this fail. oO