The same old video from their site will work for your Edge I followed it without any issues, it's very easy!
The issue you might have, I have encountered, which the two clips behind the gearstick get's stuck.
Just get a small flathead screwdriver, and gently try to push the clips away, this will require another person to help out and hold the part as you the rest from behind.
I hope you didn't get confused there Q. How's the screen clearity for the Air mirroring ?
I've tried it on my LG G3 and iPhone 6, and both suck. I'm about to get a replacement...