Can't find the Behaviour option to appear when user clicks

Hello, on this page you show that one of the behaviours we can choose for popups to show is when user clicks on something (say, a button with and CSS selector ID) But i can't find that option. I already uninstalled the Free version of PopUp, and installed the Pro version, which seems to be working fine except for that behaviour part and also the appearance sections seems to lack some options as well.

Considering i will only need the "show when click" option, and that's the reason i bought the PRO version, please help me by telling me where i can find it and how i should use it. Thanks