Chromecast or firestick in A6 C7 2015 facelift

[Kearsley5]

I've got an Audi A6 C7 2015 facelist model. 

Ive seen YouTube videos that you can install a firestick. After buying all the parts and getting an aux connection as I don't have the Audi connection under the armrest. See picture for the items I've bought for the HD firestick. 

Does anyone have any ideas how I can get the firestick to work. I've got a WiFi hot-spot in the car, just need to know how to get the device to work on the screen. 

Thanks for checking this out and helping with my question 👌