Share the Hobby with Trainer Mode (aka Buddy Box) using Turnigy 9X Transmitters

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I've been wanting to learn how to set this up for a while. I expected it to be more difficult than it is and wanted to share how to setup trainer mode with the Turnigy 9X transmitter. The trainer switch is backwards from what I'm used to. I previously did this with the DX5e and my buddy's DX6i so the Turnigy switch is opposite. Maybe there's a way to configure that but I haven't figured it out.
The quad in the video is my DIY Mini Quad which can download and 3D print from Thingiverse:
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