This site is being deprecated.
Please see the official X‑Plane Support page for help.
The avionics switches are located at the bottom of the panel, next to the pitot heat switch. They are obscured by the yoke - you have to know where to look. I suggest hiding the yoke during startup by clicking on the base of the yoke where it intersects the panel. Now you can see all of the switches and you can easily work your way across to the avionics switches. Once the cockpit check is complete you can click on the base of the yoke to restore the image before taxiing.
Like you, I was stumped until I found this video. https://www.youtube.com/watch?v=KoOJo1XjdGc
This site is no longer being actively maintained.