This site is being deprecated.
Please see the official X‑Plane Support page for help.
Let me refer you back to our August conversation:
The answers remain the same. You need a plug-in, I recommend “Xsquawkbox”. Since that time, there is now one more required download, “Audio for VATSIM”. It’s not a plug-in but a software on your computer:
This site is no longer being actively maintained.