I received a pop-up invitation to chat after I installed the chat button code but now I do not see it.
The auto-invitation is shown once per visitor per hour.
This is done in this way to avoid irritating your visitors with constant invitations to chat. You may override this behavior by forcing invitation to show.
If you are customizing the system, you don't have to wait another 60 minutes to view the auto-invite. Preview your automatic invitation at any time in Admin panel -> Chat System -> Customization-> Invitation window.